Inbred maize line PH6CF

ABSTRACT

An inbred maize line, designated PH6CF, the plants and seeds of inbred maize line PH6CF, methods for producing a maize plant, either inbred or hybrid, produced by crossing the inbred maize line PH6CF with another maize plant, and hybrid maize seeds and plants produced by crossing the inbred line PH6CF with another maize line or plant and to methods for producing a maize plant containing in its genetic material one or more transgenes and to the transgenic maize plants produced by that method. This invention also relates to inbred maize lines derived from inbred maize line PH6CF, to methods for producing other inbred maize lines derived from inbred maize line PH6CF and to the inbred maize lines derived by the use of those methods.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims benefit of the priority date of U.S. patent application Ser. No. 60/352,416 filed. Jan. 28, 2002, which is hereby incorporated herein by reference.

FIELD OF THE INVENTION

This invention is in the field of maize breeding, specifically relating to an inbred maize line designated PH6CF.

BACKGROUND OF THE INVENTION

The goal of plant breeding is to combine, in a single variety or hybrid, various desirable traits. For field crops, these traits may include resistance to diseases and insects, tolerance to heat and drought, reducing the time to crop maturity, greater yield, and better agronomic quality. With mechanical harvesting of many crops, uniformity of plant characteristics such as germination and stand establishment, growth rate, maturity, and plant and ear height, is important.

Field crops are bred through techniques that take advantage of the plant's method of pollination. A plant is self-pollinated if pollen from one flower is transferred to the same or another flower of the same plant. A plant is sib-pollinated when individuals within the same family or line are used for pollination. A plant is cross-pollinated if the pollen comes from a flower on a different plant from a different family or line. The terms “cross-pollination” and “out-cross” as used herein do not include self-pollination or sib-pollination.

Plants that have been self-pollinated and selected for type for many generations become homozygous at almost all gene loci and produce a uniform population of true breeding progeny. A cross between two different homozygous lines produces a uniform population of hybrid plants that may be heterozygous for many gene loci. A cross of two plants, each heterozygous at a number of gene loci, will produce a population of hybrid plants that differ genetically and will not be uniform.

Maize (zea mays L.), often referred to as corn in the United States, can be bred by both self-pollination and cross-pollination techniques. Maize has separate male and female flowers on the same plant, located on the tassel and the ear, respectively. Natural pollination occurs in maize when wind blows pollen from the tassels to the silks that protrude from the tops of the ears.

A reliable method of controlling male fertility in plants offers the opportunity for improved plant breeding. This is especially true for development of maize hybrids, which relies upon some sort of male sterility system. There are several ways in which a maize plant can be manipulated so that it is male sterile. These include use of manual or mechanical emasculation (or detasseling), use of cytoplasmic genetic or nuclear genetic male sterility, use of gametocides and the like.

Hybrid maize seed is typically produced by a male sterility system incorporating manual or mechanical detasseling. Alternate strips of two maize inbreds are planted in a field, and the pollen-bearing tassels are removed from one of the inbreds (female). Provided that there is sufficient isolation from sources of foreign maize pollen, the ears of the detasseled inbred will be fertilized only from the other inbred (male), and the resulting seed is therefore hybrid and will form hybrid plants.

The laborious detasseling process can be avoided by using cytoplasmic male-sterile (CMS) inbreds. Plants of a CMS inbred are male sterile as a result of factors resulting from the cytoplasmic, as opposed to the nuclear, genome. Thus, this characteristic is inherited exclusively through the female parent in maize plants, since only the female provides cytoplasm to the fertilized seed. CMS plants are fertilized with pollen from another inbred that is not male-sterile. Pollen from the second inbred may or may not contribute genes that make the hybrid plants male-fertile. The same hybrid seed, a portion produced from detasseled fertile maize and a portion produced using the CMS system, can be blended to insure that adequate pollen loads are available for fertilization when the hybrid plants are grown.

There are several methods of conferring genetic male sterility available, such as multiple mutant genes at separate locations within the genome that confer male sterility, as disclosed in U.S. Pat. Nos. 4,654,465 and 4,727,219 to Brar et al. and chromosomal translocations as described by Patterson in U.S. Pat. Nos. 3,861,709 and 3,710,511. These and all patents, patent applications and publications referred to herein are incorporated by reference. In addition to these methods, Albertsen et al., of Pioneer Hi-Bred, U.S. Pat. No. 5,432,068, have developed a system of nuclear male sterility which includes: identifying a gene which, is critical to male fertility; silencing this native gene which is critical to male fertility; removing the native promoter from the essential male fertility gene and replacing it with an inducible promoter; inserting this genetically engineered gene back into the plant; and thus creating a plant that is male sterile because the inducible promoter is not “on” resulting in the male fertility gene not being transcribed. Fertility is restored by inducing, or turning “on”, the promoter, which in turn allows the gene that confers male fertility to be transcribed.

These, and the other methods of conferring genetic male sterility in the art, each possess their own benefits and drawbacks. Some other methods use a variety of approaches such as delivering into the plant a gene encoding a cytotoxic substance associated with a male tissue specific promoter or an antisense system in which a gene critical to fertility is identified and an antisense to that gene is inserted in the plant (see: Fabinjanski, et al. EPO 89/3010153.8 publication no. 329,308 and PCT application PCT/CA90/00037 published as WO 90/08828).

Another system for controlling male sterility makes use of gametocides. Gametocides are not a genetic system, but rather a topical application of chemicals. These chemicals affect cells that are critical to male fertility. The application of these chemicals affects fertility in the plants only for the growing season in which the gametocide is applied (see Carlson, Glenn R., U.S. Pat. No.: 4,936,904). Application of the gametocide, timing of the application and genotype specificity often limit the usefulness of the approach and it is not appropriate in all situations.

Development of Maize Inbred Lines

The use of male sterile inbreds is but one factor in the production of maize hybrids. Plant breeding techniques known in the art and used in a maize plant breeding program include, but are not limited to, recurrent selection, backcrossing, pedigree breeding, restriction fragment length polymorphism enhanced selection, genetic marker enhanced selection, making double haploids, and transformation. Often a combination of these techniques is used. The development of maize hybrids in a maize plant breeding program requires, in general, the development of homozygous inbred lines, the crossing of these lines, and the evaluation of the crosses.

Maize plant breeding programs combine the genetic backgrounds from two or more inbred lines or various other germplasm sources into breeding populations from which new inbred lines are developed by selfing and selection of desired phenotypes. The new inbreds are crossed with other inbred lines and the hybrids from these crosses are evaluated to determine which of those have commercial potential. Plant breeding and hybrid development, as practiced in a maize plant breeding program developing significant genetic advancement, are expensive and time-consuming processes.

Pedigree breeding starts with the crossing of two genotypes, such as two elite inbred lines, each of which may have one or more desirable characteristics that is lacking in the other or which complements the other. If the two original parents do not provide all the desired characteristics, other sources can be included in the breeding population. In the pedigree method, superior plants are selfed and selected in successive filial generations. In the succeeding filial generations the heterozygous condition gives way to homogeneous lines as a result of self-pollination and selection. Typically in the pedigree method of breeding, five or more successive filial generations of selfing and selection is practiced: F₁→F₂; F₂→F₃; F₃→F₄; F₄→F₅, etc. After a sufficient amount of inbreeding, successive filial generations will serve to increase seed of the developed inbred. Preferably, an inbred line comprises homozygous alleles at about 95% or more of its loci.

Backcrossing can be used to improve an inbred line and a hybrid that is made using those inbreds. Backcrossing can be used to transfer a specific desirable trait from one line, the donor parent, to an inbred called the recurrent parent which has overall good agronomic characteristics yet lacks that desirable trait. This transfer of the desirable trait into an inbred with overall good agronomic characteristics can be accomplished by first crossing a recurrent parent and a donor parent (non-recurrent parent). The progeny of this cross is then mated back to the recurrent parent followed by selection in the resultant progeny for the desired trait to be transferred from the non-recurrent parent as well as selection for the characteristics of the recurrent parent. Typically after four or more backcross generations with selection for the desired trait and the characteristics of the recurrent parent, the progeny will contain essentially all genes of the recurrent parent except for the genes controlling the desired trait. However, the number of backcross generations can be less if molecular markers are used during selection or elite germplasm is used as the donor parent. The last backcross generation is then selfed to give pure breeding progeny for the gene(s) being transferred. Backcrossing can also be used in conjunction with pedigree breeding to develop new inbred lines. For example, an F1 can be created that is backcrossed to one of its parent lines to create a BC1, BC2, BC3, etc. Progeny are selfed and selected so that the newly developed inbred has many of the attributes of the recurrent parent and some of the desired attributes of the non-recurrent parent. This approach leverages the value and strengths of the recurrent parent for use in new hybrids and breeding which has very significant value, for a breeder.

Recurrent selection is a method used in a plant breeding program to improve a population of plants. The method entails individual plants cross pollinating with each other to form progeny, which are then grown. The superior progeny are then selected by any number of methods, which include individual plant, half-sib progeny, full-sib progeny, selfed progeny and topcrossing. The selected progeny are cross pollinated with each other to form progeny for another population. This population is planted and again superior plants are selected to cross pollinate with each other. Recurrent selection is a cyclical process and therefore can be repeated as many times as desired. The objective of recurrent selection is to improve the traits of a population. The improved population can then be used as a source of breeding material to obtain inbred lines to be used in hybrids or used as parents for a synthetic cultivar. A synthetic cultivar is the resultant progeny formed by the intercrossing of several selected inbreds. Mass selection is a useful technique when used in conjunction with is molecular marker enhanced selection.

Mutation breeding is one of the many methods of introducing new traits into inbred lines. Mutations that occur spontaneously or are artificially induced can be useful sources of variability for a plant breeder. The goal of artificial mutagenesis is to increase the rate of mutation for a desired characteristic. Mutation rates can be increased by many different means including temperature, long-term seed storage, tissue culture conditions, radiation; such as X-rays, Gamma rays (e.g. cobalt 60 or cesium 137), neutrons, (product of nuclear fission by uranium 235 in an atomic reactor), Beta radiation (emitted from radioisotopes such as phosphorus 32 or carbon 14), or ultraviolet radiation (preferably from 2500 to 2900 nm), or chemical mutagens (such as base analogues (5-bromo-uracil), related compounds (8-ethoxy caffeine), antibiotics (streptonigrin), alkylating agents (sulfur mustards, nitrogen mustards, epoxides, ethylenamines, sulfates, sulfonates, sulfones, lactones), azide, hydroxylamine, nitrous acid, or acridines. Once a desired trait is observed through mutagenesis the trait may then be incorporated into existing germplasm by traditional breeding techniques.

Details of mutation breeding can be found in “Principals of Cultivar Development” Fehr, 1993 Macmillan Publishing Company the disclosure of which is incorporated herein by reference.

Molecular markers, which includes markers identified through the use of techniques such as Isozyme Electrophoresis, Restriction Fragment Length Polymorphisms (RFLPs), Randomly Amplified Polymorphic DNAs (RAPDs), Arbitrarily Primed Polymerase Chain Reaction (AP-PCR), DNA Amplification Fingerprinting (DAF), Sequence Characterized Amplified Regions (SCARs), Amplified Fragment Length Polymorphisms (AFLPs), Simple Sequence Repeats (SSRs) and Single Nucleotide Polymorphisms (SNPs), may be used in plant breeding methods. One use of molecular markers is Quantitative Trait Loci (QTL) mapping. QTL mapping is the use of markers, which are known to be closely linked to alleles that have measurable effects on a quantitative trait. Selection in the breeding process is based upon the accumulation of markers linked to the positive effecting alleles and/or the elimination of the markers linked to the negative effecting alleles from the plant's genome.

Molecular markers can also be used during the breeding process for the selection of qualitative traits. For example, markers closely linked to alleles or markers containing sequences within the actual alleles of interest can be used to select plants that contain the alleles of interest during a backcrossing breeding program. The markers can also be used to select for the genome of the recurrent parent and against the genome of the donor parent. Using this procedure can minimize the amount of genome from the donor parent that remains in the selected plants. It can also be used to reduce the number of crosses back to the recurrent parent needed in a backcrossing program. The use of molecular markers in the selection process is often called genetic marker enhanced selection.

The production of double haploids can also be used for the development of inbreds in the breeding program. Double haploids are produced by the doubling of a set of chromosomes (1 N) from a heterozygous plant to produce a completely homozygous individual. For example, see Wan et al., “Efficient Production of Doubled Haploid Plants Through Colchicine Treatment of Anther-Derived Maize Callus”. Theoretical and Applied Genetics, 77:889-892, 1989. This can be advantageous because the process omits the generations of selfing needed to obtain a homozygous plant from a heterozygous source.

Development of Maize Hybrids

A single cross maize hybrid results from the cross of two inbred lines, each of which has a genotype that complements the genotype of the other. The hybrid progeny of the first generation is designated F₁. In the development of commercial hybrids in a maize plant breeding program, only the F₁, hybrid plants are sought. F₁ hybrids are more vigorous than their inbred parents. This hybrid vigor, or heterosis, can be manifested in many polygenic traits, including increased vegetative growth and increased yield.

The development of a maize hybrid in a maize plant breeding program involves three steps: (1) the selection of plants from various germplasm pools for initial breeding crosses; (2) the selfing of the selected plants from the breeding crosses for several generations to produce a series of inbred lines, which, although different from each other, breed true and are highly uniform; and (3) crossing the selected inbred lines with different inbred lines to produce the hybrids. During the inbreeding process in maize, the vigor of the lines decreases. Vigor is restored when two different inbred lines are crossed to produce the hybrid. An important consequence of the homozygosity and homogeneity of the inbred lines is that the hybrid between a defined pair of inbreds will always be the same. Once the inbreds that give a superior hybrid have been identified, the hybrid seed can be reproduced indefinitely as long as the homogeneity of the inbred parents is maintained.

A single cross hybrid is produced when two inbred lines are crossed to produce the F₁ progeny. A double cross hybrid is produced from four inbred lines crossed in pairs (A×B and C×D) and then the two F₁ hybrids are crossed again (A×B)×(C×D). A three-way cross hybrid is produced from three inbred lines where two of the inbred lines are crossed (A×B) and then the resulting F₁ hybrid is crossed with the third inbred (A×B)×C. Much of the hybrid vigor and uniformity exhibited by F₁ hybrids is lost in the next generation (F₂). Consequently, seed produced from hybrids is not used for planting stock.

Hybrid seed production requires elimination or inactivation of pollen produced by the female parent. Incomplete removal or inactivation of the pollen provides the potential for self-pollination. This inadvertently self-pollinated seed may be unintentionally harvested and packaged with hybrid seed. Also, because the male parent is grown next to the female parent in the field there is the very low probability that the male selfed seed could be unintentionally harvested and packaged with the hybrid seed. Once the seed from the hybrid bag is planted, it is possible to identify and select these self-pollinated plants. These self-pollinated plants will be genetically equivalent to one of the inbred lines used to produce the hybrid. Though the possibility of inbreds being included hybrid seed bags exists, the occurrence is rare because much care is taken to avoid such inclusions. It is worth noting that hybrid seed is sold to growers for the production of grain or forage and not for breeding or seed production.

These self-pollinated plants can be identified and selected by one skilled in the art due to their decreased vigor when compared to the hybrid. lnbreds are identified by their less vigorous appearance for vegetative and/or reproductive characteristics, including shorter plant height, small ear size, ear and kernel shape, cob color, or other characteristics.

Identification of these self-pollinated lines can also be accomplished through molecular marker analyses. See, “The Identification of Female Selfs in Hybrid Maize: A Comparison Using Electrophoresis and Morphology”, Smith, J. S. C. and Wych, R. D., Seed Science and Technology 14, pp. 1-8 (1995), the disclosure of which is expressly incorporated herein by reference. Through these technologies, the homozygosity of the self-pollinated line can be verified by analyzing allelic composition at various loci along the genome. Those methods allow for rapid identification of the invention disclosed herein. See also, “Identification of Atypical Plants in Hybrid Maize Seed by Postcontrol and Electrophoresis” Sarca, V. et al., Probleme de Genetica Teoritica si Aplicata Vol. 20 (1) p. 29-42.

As is readily apparent to one skilled in the art, the foregoing are only some of the various ways by which the inbred can be obtained by those looking to use the germplasm. Other means are available, and the above examples are illustrative only.

Maize is an important and valuable field crop. Thus, a continuing goal of plant breeders is to develop high-yielding maize hybrids that are agronomically sound based on stable inbred lines. The reasons for this goal are obvious: to maximize the amount of grain produced with the inputs used and minimize susceptibility of the crop to pests and environmental stresses. To accomplish this goal, the maize breeder must select and develop superior inbred parental lines for producing hybrids. This requires identification and selection of genetically unique individuals that occur in a segregating population. The segregating population is the result of a combination of crossover events plus the independent assortment of specific combinations of alleles at many gene loci that results in specific genotypes. The probability of selecting any one individual with a specific genotype from a breeding cross is infinitesimal due to the large number of segregating genes and the unlimited recombinations of these genes, some of which may be closely linked. However, the genetic variation among individual progeny of a breeding cross allows for the identification of rare and valuable new genotypes. These new genotypes are neither predictable nor incremental in value, but rather the result of manifested genetic variation combined with selection methods, environments and the actions of the breeder. Once identified, it is possible to utilize routine and predictable breeding methods to develop progeny that retain the rare ane valuable new genotypes developed by the initial breeder.

Even if the entire genotypes of the parents of the breeding cross were characterized and a desired genotype known, only a few if any individuals having the desired genotype may be found in a large segregating F₂ population. It would be very unlikely that a breeder of ordinary skill in the art would able to recreate the same line twice from the very same original parents, as the breeder is unable to direct how the genomes combine or how they will interact with the environmental conditions. This unpredictability results in the expenditure of large amounts of research resources in the development of a superior new maize inbred line. Once such a line is developed its value to society is substantial since it is important to advance the germplasm base as a whole in order to maintain or improve traits such as yield, disease resistance, pest resistance and plant performance in extreme weather conditions.

A breeder uses various methods to help determine which plants should be selected from the segregating populations and ultimately which inbred lines will be used to develop hybrids for commercialization. In addition to the knowledge of the germplasm and other skills the breeder uses, a part of the selection process is dependent on experimental design coupled with the use of statistical analysis. Experimental design and statistical analysis are used to help determine which plants, which family of plants, and finally which inbred lines and hybrid combinations are significantly better or different for one or more traits of interest. Experimental design methods are used to assess error so that differences between two inbred lines or two hybrid lines can be more accurately determined. Statistical analysis includes the calculation of mean values, determination of the statistical significance of the sources of variation, and the calculation of the appropriate variance components. Either a five or a one percent significance level is customarily used to determine whether a difference that occurs for a given trait is real or due to the environment or experimental error. One of ordinary skill in the art of plant breeding would know how to evaluate the traits of two plant varieties to determine if there is no significant difference between the two traits expressed by those varieties. For example, see Fehr, Walt, Principles of Cultivar Development, p. 261-286 (1987) which is incorporated herein by reference. Mean trait values may be used to determine whether trait differences are significant, and preferably the traits are measured on plants grown under the same environmental conditions.

Combining ability of a line, as well as the performance of the line per se, is a factor in the selection of improved maize inbreds. Combining ability refers to a line's contribution as a parent when crossed with other lines to form hybrids. The hybrids formed for the purpose of selecting superior lines are designated as testcrosses. One way of measuring combining ability is by using breeding values. Breeding values are based in part on the overall mean of a number of testcrosses. This mean is then adjusted to remove environmental effects and it is adjusted for known genetic relationships among the lines.

SUMMARY OF THE INVENTION

According to the invention, there is provided a novel inbred maize line, designated PH6CF. This invention thus relates to the seeds of inbred maize line PH6CF, to the plants of inbred maize line PH6CF, to plant parts of inbred maize line PH6CF, to methods for producing a maize plant produced by crossing the inbred maize line PH6CF with another maize plant, including a plant that is part of a synthetic or natural population, and to methods for producing a maize plant containing in its genetic material one or more transgenes and to the transgenic maize plants and plant parts produced by that method. This invention also relates to inbred maize lines and plant parts derived from inbred maize line PH6CF, to methods for producing other inbred maize lines and their parts derived from inbred maize line PH6CF and to the inbred maize lines derived by the use of those methods. This invention further relates to hybrid maize seeds, plants, and plant parts produced by crossing the inbred line PH6CF with another maize line.

Definitions

Certain definitions used in the specification are provided below. Also in the examples that follow, a number of terms are used herein. In order to provide a clear and consistent understanding of the specification and claims, including the scope to be given such terms, the following definitions are provided. NOTE: ABS is in absolute terms and % MN is percent of the mean for the experiments in which the inbred or hybrid was grown. PCT designates that the trait is calculated as a percentage. % NOT designates the percentage of plants that did not exhibit a trait. For example, STKLDG % NOT is the percentage of plants in a plot that were not stalk lodged. These designators will follow the descriptors to denote how the values are to be interpreted.

ABTSTK=ARTIFICIAL BRITTLE STALK. A count of the number of “snapped” plants per plot following machine snapping. A snapped plant has its stalk completely snapped at a node between the base of the plant and the node above the ear. Expressed as percent of plants that did not snap.

ALLELE. Any of one or more alternative forms of a genetic sequence. In a diploid cell or organism, the two alleles of a given sequence occupy corresponding loci on a pair of homologous chromosomes.

ANT ROT=ANTHRACNOSE STALK ROT (Colletotlichum graminicola). A 1 to 9 visual rating indicating the resistance to Anthracnose Stalk Rot. A higher score indicates a higher resistance.

BACKCROSSING. Process in which a breeder crosses a progeny line back to one of the parental genotypes one or more times.

BARPLT=BARREN PLANTS. The percent of plants per plot that was not barren (lack ears).

BREEDING. The genetic manipulation of living organisms.

BRTSTK=BRITTLE STALKS. This is a measure of the stalk breakage near the time of pollination, and is an indication of whether a hybrid or inbred would snap or break near the time of flowering under severe winds. Data are presented as percentage of plants that did not snap.

CLDTST=COLD TEST. The percent of plants that germinate under cold test conditions.

CLN=CORN LETHAL NECROSIS. Synergistic interaction of maize chlorotic mottle virus (MCMV) in combination with either maize dwarf mosaic virus (MDMV-A or MDMV-B) or wheat streak mosaic virus (WSMV). A 1 to 9 visual rating indicating the resistance to Corn Lethal Necrosis. A higher score indicates a higher resistance.

COMRST=COMMON RUST (Puccinia sorghi). A 1 to 9 visual rating indicating the resistance to Common Rust. A higher score indicates a higher resistance.

D/D=DRYDOWN. This represents the relative rate at which a hybrid will reach acceptable harvest moisture compared to other hybrids on a 1-9 rating scale. A high score indicates a hybrid that dries relatively fast while a low score indicates a hybrid that dries slowly.

DIPERS=DIPLODIA EAR MOLD SCORES (Diplodia maydis and Diplodia macrospora). A 1 to 9 visual rating indicating the resistance to Diplodia Ear Mold. A higher score indicates a higher resistance.

DIPROT=DIPLODIA STALK ROT SCORE. Score of stalk rot severity due to Diplodia (Diplodia maydis). Expressed as a 1 to 9 score with 9 being highly resistant.

DRPEAR=DROPPED EARS. A measure of the number of dropped ears per plot and represents the percentage of plants that did not drop ears prior to harvest.

D/T=DROUGHT TOLERANCE. This represents a 1-9 rating for drought tolerance, and is based on data obtained under stress conditions. A high score indicates good drought tolerance and a low score indicates poor drought tolerance.

EARHT=EAR HEIGHT. The ear height is a measure from the ground to the highest placed developed ear node attachment and is measured in centimeters.

EARMLD=General Ear Mold. Visual rating (1-9 score) where a “1” is very susceptible and a “9” is very resistant. This is based on overall rating for ear mold of mature ears without determining the specific mold organism, and may not be predictive for a specific ear mold.

EARSZ=EAR SIZE. A 1 to 9 visual rating of ear size. The higher the rating the larger the ear size.

EBTSTK=EARLY BRITTLE STALK. A count of the number of “snapped” plants per plot following severe winds when the corn plant is experiencing very rapid vegetative growth in the V5-V8 stage. Expressed as percent of plants that did not snap.

ECB1LF=EUROPEAN CORN BORER FIRST GENERATION LEAF FEEDING (Ostinia nubilalis). A 1 to 9 visual rating indicating the resistance to preflowering leaf feeding by first generation European Corn Borer. A higher score indicates a higher resistance.

ECB2IT=EUROPEAN CORN BORER SECOND GENERATION INCHES OF TUNNELING (Ostrinia nubilalis). Average inches of tunneling per plant in the stalk.

ECB2SC=EUROPEAN CORN BORER SECOND GENERATION (Ostrinia nubilalis). A 1 to 9 visual rating indicating post flowering degree of stalk breakage and other evidence of feeding by European Corn Borer, Second Generation. A higher score indicates a higher resistance.

ECBDPE=EUROPEAN CORN BORER DROPPED EARS (Ostrinia nubilalis). Dropped ears due to European Corn Borer. Percentage of plants that did not drop ears under second generation corn borer infestation.

EGRWTH=EARLY GROWTH. This is a measure of the relative height and size of a corn seedling at the 24 leaf stage of growth. This is a visual rating (1 to 9), with 1 being weak or slow growth, 5 being average growth and 9 being strong growth. Taller plants, wider leaves, more green mass and darker color constitute higher score.

ELITE INBRED. An inbred that contributed desirable qualities when used to produce commercial hybrids. An elite inbred may also be used in further breeding.

ERTLDG=EARLY ROOT LODGING. Early root lodging is the percentage of plants that do not root lodge prior to or around anthesis; plants that lean from the vertical axis at an approximately 300 angle or greater would be counted as root lodged.

ERTLPN=Early root lodging. An estimate of the percentage of plants that do not root lodge prior to or around anthesis; plants that lean from the vertical axis at an approximately 30° angle or greater would be considered as root lodged.

ERTLSC=EARLY ROOT LODGING SCORE. Score for severity of plants that lean from a vertical axis at an approximate 30-degree angle greater, which typically results from strong winds prior to or around flowering recorded within 2 weeks of a wind event. Expressed as a 1 to 9 score with 9 being no lodging.

ESTCNT=EARLY STAND COUNT. This is a measure of the stand establishment in the spring and represents the number of plants that emerge on per plot basis for the inbred or hybrid.

EYESPT=Eye Spot (Kabatiella zeae or Aureobasidium zeae). A 1 to 9 visual rating indicating the resistance to Eye Spot. A higher score indicates a higher resistance.

FUSERS=FUSARIUM EAR ROT SCORE (Fusarium moniliforme or Fusarium:subglutinans). A 1 to 9 visual rating indicating the resistance to Fusarium ear rot. A higher score indicates a higher resistance.

GDU=Growing Degree Units. Using the Barger Heat Unit Theory, which assumes that maize growth occurs in the temperature range 50° F.-86° F. and that temperatures outside this range slow down growth; the maximum daily heat unit accumulation is 36 and the minimum daily heat unit accumulation is 0. The seasonal accumulation of GDU is a major factor in determining maturity zones.

GDUSHD=GDU TO SHED. The number of growing degree units (GDUs) or heat units required for an inbred line or hybrid to have approximately 50 percent of the plants shedding pollen and is measured from the time of planting. Growing degree units are calculated by the Barger Method, where the heat units for a 24-hour period are: ${G\quad D\quad U} = {\frac{\left( {{Max}.\quad{temp}.{+ {{Min}.\quad{temp}.}}} \right)}{2} - 50}$

The highest maximum temperature used is 86° F. and the lowest minimum temperature used is 50° F. For each inbred or hybrid it takes a certain number of GDUs to reach various stages of plant development.

GDUSLK=GDU TO SILK. The number of growing degree units required for an inbred line or hybrid to have approximately 50 percent of the plants with silk emergence from time of planting. Growing degree units are calculated by the Barger Method as given in GDU SHD definition.

GENOTYPE. Refers to the genetic constitution of a cell or organism.

GIBERS=GIBBERELLA EAR ROT (PINK MOLD) (Gibberella zeae). A 1 to 9 visual rating indicating the resistance to Gibberella Ear Rot. A higher score indicates a higher resistance.

GIBROT=GIBBERELLA STALK ROT SCORE. Score of stalk rot severity due to Gibberella (Gibberella zeae). Expressed as a 1 to 9 score with 9 being highly resistant.

GLFSPT=Gray Leaf Spot (Cercospora zeae-maydis). A 1 to 9 visual rating indicating the resistance to Gray Leaf Spot. A higher score indicates a higher resistance.

GOSWLT=Goss' Wilt (Corynebacterium nebraskense). A 1 to 9 visual rating indicating the resistance to Goss' Wilt. A higher score indicates a higher resistance.

GRNAPP=GRAIN APPEARANCE. This is a 1 to 9 rating for the general appearance of the shelled grain as it is harvested based on such factors as the color of harvested grain, any mold on the grain, and any cracked grain. High scores indicate good grain quality.

H/POP=YIELD AT HIGH DENSITY. Yield ability at relatively high plant densities on 1-9 relative rating system with a higher number indicating the hybrid responds well to high plant densities for yield relative to other hybrids. A 1, 5, and 9 would represent very poor, average, and very good yield response, respectively, to increased plant density.

HCBLT=HELMINTHOSPORIUM CARBONUM LEAF BLIGHT (Helminthosporium carbonum). A 1 to 9 visual rating indicating the resistance to Helminthosporium infection. A higher score indicates a higher resistance.

HD SMT=HEAD SMUT (Sphacelotheca reiliana). This score indicates the percentage of plants not infected.

HSKCVR═HUSK COVER. A 1 to 9 score based on performance relative to key checks, with a score of 1 indicating very short husks, tip of ear and kernels showing; 5 is intermediate coverage of the ear under most conditions, sometimes with thin husk; and a 9 has husks extending and closed beyond the tip of the ear. Scoring can best be done near physiological maturity stage or any time during dry down until harvested.

INC D/A=GROSS INCOME (DOLLARS PER ACRE). Relative income per acre assuming drying costs of two cents per point above 15.5 percent harvest moisture and current market price per bushel.

INCOME/ACRE. Income advantage of hybrid to be patented over other hybrid on per acre basis.

INC ADV=GROSS INCOME ADVANTAGE. GROSS INCOME advantage of variety #1 over variety #2.

KSZDCD=KERNEL SIZE DISCARD. The percent of discard seed; calculated as the sum of discarded tip kernels and extra large kernels.

LINKAGE. Refers to a phenomenon wherein alleles on the same chromosome tend to segregate together more often than expected by chance if their transmission was independent.

LINKAGE DISEQUILIBRIUM. Refers to a phenomenon wherein alleles tend to remain together in linkage groups when segregating from parents to offspring, with a greater frequency than expected from their individual frequencies.

L/POP=YIELD AT LOW DENSITY. Yield ability at relatively low plant densities on a 1-9 relative system with a higher number indicating the hybrid responds well to low plant densities for yield relative to other hybrids. A 1, 5, and 9 would represent very poor, average, and very good yield response, respectively, to low plant density.

LRTLDG=LATE ROOT LODGING. Late root lodging is the percentage of plants that do not root lodge after anthesis through harvest; plants that lean from the vertical axis at an approximately 30° angle or greater would be counted as root lodged.

LRTLPN=LATE ROOT LODGING. Late root lodging is an estimate of the percentage of plants that do not root lodge after anthesis through harvest; plants that lean from the vertical axis at an approximately 30° angle or greater would be considered as root lodged.

LRTLSC=LATE ROOT LODGING SCORE. Score for severity of plants that lean from a vertical axis at an approximate 30-degree angle or greater which typically results from strong winds after flowering. Recorded prior to harvest when a root-lodging event has occurred. This lodging results in plants that are leaned or “lodged” over at the base of the plant and do not straighten or “goose-neck” back to a vertical position. Expressed as a 1 to 9 score with 9 being no lodging.

MDMCPX=MAIZE DWARF MOSAIC COMPLEX (MDMV=Maize Dwarf Mosaic Virus and MCDV=Maize Chlorotic Dwarf Virus). A 1 to 9 visual rating indicating the resistance to Maize Dwarf Mosaic Complex. A higher score indicates a higher resistance.

MST=HARVEST MOISTURE. The moisture is the actual percentage moisture of the grain at harvest.

MSTADV=MOISTURE ADVANTAGE. The moisture advantage of variety #1 over variety #2 as calculated by: MOISTURE of variety #2-MOISTURE of variety #1=MOISTURE ADVANTAGE of variety #1.

NLFBLT=Northern Leaf Blight (Helminthosporum turcicum or Exserohilum turcicum). A 1 to 9 visual rating indicating the resistance to Northern Leaf Blight. A higher score indicates a higher resistance.

OILT=GRAIN OIL. Absolute value of oil content of the kernel as predicted by Near-Infrared Transmittance and expressed as a percent of dry matter.

PEDIGREE DISTANCE. Relationship among generations based on their ancestral links as evidenced in pedigrees. May be measured by the distance of the pedigree from a given starting point in the ancestry.

PLTHT=PLANT HEIGHT. This is a measure of the height of the plant from the ground to the tip of the tassel in centimeters.

POLSC=POLLEN SCORE. A 1 to 9 visual rating indicating the amount of pollen shed. The higher the score the more pollen shed.

POLWT=POLLEN WEIGHT. This is calculated by dry weight of tassels collected as shedding commences minus dry weight from similar tassels harvested after shedding is complete.

POP K/A=PLANT POPULATIONS. Measured as 1000s per acre.

POP ADV=PLANT POPULATION ADVANTAGE. The plant population advantage of variety #1 over variety #2 as calculated by PLANT POPULATION of variety #2-PLANT POPULATION of variety #1=PLANT POPULATION ADVANTAGE of variety #1.

PRM=PREDICTED RELATIVE MATURITY. This trait, predicted relative maturity, is based on the harvest moisture of the grain. The relative maturity rating is based on a known set of checks and utilizes standard linear regression analyses and is also referred to as the Comparative Relative Maturity Rating System that is similar to the Minnesota Relative Maturity Rating System.

PRMSHD=A relative measure of the growing degree units (GDU) required to reach 50% pollen shed. Relative values are predicted values from the linear regression of observed GDU's on relative maturity of commercial checks.

PROT=GRAIN PROTEIN. Absolute value of protein content of the kernel as predicted by Near-Infrared Transmittance and expressed as a percent of dry matter.

RTLDG=ROOT LODGING. Root lodging is the percentage of plants that do not root lodge; plants that lean from the vertical axis at an approximately 300 angle or greater would be counted as root lodged.

RTLADV=ROOT LODGING ADVANTAGE. The root lodging advantage of variety #1 over variety #2.

SCTGRN=SCATTER GRAIN. A 1 to 9 visual rating indicating the amount of scatter grain (lack of pollination or kernel abortion) on the ear. The higher the score the less scatter grain.

SDGVGR=SEEDLING VIGOR. This is the visual rating (1 to 9) of the amount of vegetative growth after emergence at the seedling stage (approximately five leaves). A higher score indicates better vigor.

SEL IND=SELECTION INDEX. The selection index gives a single measure of the hybrid's worth based on information for up to five traits. A maize breeder may utilize his or her own set of traits for the selection index. One of the traits that is almost always included is yield. The selection index data presented in the tables represent the mean value averaged across testing stations.

SLFBLT=SOUTHERN LEAF BLIGHT (Helminthosporium maydis or Bipolatis maydis). A 1 to 9 visual rating indicating the resistance to Southern Leaf Blight. A higher score indicates a higher resistance.

SOURST=SOUTHERN RUST (Puccinia polysora). A 1 to 9 visual rating indicating the resistance to Southern Rust. A higher score indicates a higher resistance.

STAGRN=STAY GREEN. Stay green is the measure of plant health near the time of black layer formation (physiological maturity). A high score indicates better late-season plant health.

STDADV=STALK STANDING ADVANTAGE. The advantage of variety #1 over variety #2 for the trait STK CNT.

STKCNT=NUMBER OF PLANTS. This is the final stand or number of plants per plot.

STKLDG=STALK LODGING REGULAR. This is the percentage of plants that did not stalk lodge (stalk breakage) at regular harvest (when grain moisture is between about 20 and 30%) as measured by either natural lodging or pushing the stalks and determining the percentage of plants that break below the ear.

STKLDL=LATE STALK LODGING. This is the percentage of plants that did not stalk lodge (stalk breakage) at or around late season harvest (when grain moisture is between about 15 and 18%) as measured by either natural lodging or pushing the stalks and determining the percentage of plants that break below the ear.

STKLDS=STALK LODGING SCORE. A plant is considered as stalk lodged if the stalk is broken or crimped between the ear and the ground. This can be caused by any or a combination of the following: strong winds late in the season, disease pressure within the stalks, ECB damage or genetically weak stalks. This trait should be taken just prior to or at harvest. Expressed on a 1 to 9 scale with 9 being no lodging.

STLPCN=STALK LODGING REGULAR. This is an estimate of the percentage of plants that did not stalk lodge (stalk breakage) at regular harvest (when grain moisture is between about 20 and 30%) as measured by either natural lodging or pushing the stalks and determining the percentage of plants that break below the ear.

STRT=GRAIN STARCH. Absolute value of starch content of the kernel as predicted by Near-Infrared Transmittance and expressed as a percent of dry matter.

STWWLT=Stewart's Wilt (Erwinia stewartii). A 1 to 9 visual rating indicating the resistance to Stewart's Wilt. A higher score indicates a higher resistance.

TASBLS=TASSEL BLAST. A 1 to 9 visual rating was used to measure the degree of blasting (necrosis due to heat stress) of the tassel at the time of flowering. A 1 would indicate a very high level of blasting at time of flowering, while a 9 would have no tassel blasting.

TASSZ=TASSEL SIZE. A 1 to 9 visual rating was used to indicate the relative size of the tassel. The higher the rating the larger the tassel.

TAS WT=TASSEL WEIGHT. This is the average weight of a tassel (grams) just prior to pollen shed.

TEXEAR=EAR TEXTURE. A 1 to 9 visual rating was used to indicate the relative hardness (smoothness of crown) of mature grain. A 1 would be very soft (extreme dent) while a 9 would be very hard (flinty or very smooth crown).

TILLER=TILLERS. A count of the number of tillers per plot that could possibly shed pollen was taken. Data are given as a percentage of tillers: number of tillers per plot divided by number of plants per plot.

TSTWT=TEST WEIGHT (UNADJUSTED). The measure of the weight of the grain in pounds for a given volume (bushel).

TSWADV=TEST WEIGHT ADVANTAGE. The test weight advantage of variety #1 over variety #2.

WIN M % PERCENT MOISTURE WINS.

WIN Y %=PERCENT YIELD WINS.

YIELD BU/A=YIELD (BUSHELS/ACRE). Yield of the grain at harvest in bushels per acre adjusted to 15% moisture.

YLDADV=YIELD ADVANTAGE. The yield advantage of variety #1 over variety #2 as calculated by: YIELD of variety #1-YIELD variety #2=yield advantage of variety #1.

YLDSC=YIELD SCORE. A 1 to 9 visual rating was used to give a relative rating for yield based on plot ear piles. The higher the rating the greater visual yield appearance.

Definitions for Area of Adaptability

When referring to area of adaptability, such term is used to describe the location with the environmental conditions that would be well suited for this maize line. Area of adaptability is based on a number of factors, for example: days to maturity, insect resistance, disease resistance, and drought resistance. Area of adaptability does not indicate that the maize line will grow in every location within the area of adaptability or that it will not grow outside the area.

-   Central Corn Belt: Iowa, Illinois, Indiana -   Drylands: non-irrigated areas of North Dakota, South Dakota,     Nebraska, Kansas, Colorado and Oklahoma -   Eastern U.S.: Ohio, Pennsylvania, Delaware, Maryland, Virginia, and     West Virginia -   North central U.S.: Minnesota and Wisconsin -   Northeast: Michigan, New York, Vermont, and Ontario and Quebec     Canada -   Northwest U.S.: North Dakota, South Dakota, Wyoming, Washington,     Oregon, Montana, Utah, and Idaho -   South central U.S.: Missouri, Tennessee, Kentucky, and Arkansas -   Southeast U.S.: North Carolina, South Carolina, Georgia, Florida,     Alabama, Mississippi, and Louisiana -   Southwest U.S.: Texas, Oklahoma, New Mexico, and Arizona -   Western U.S.: Nebraska, Kansas, Colorado, and California -   Maritime Europe: France, Germany, Belgium and Austria

DETAILED DESCRIPTION OF THE INVENTION

Inbred maize lines are typically developed for use in the production of hybrid maize lines. Inbred maize lines need to be highly homogeneous, substantially homozygous and reproducible to be useful as parents of commercial hybrids. There are many analytical methods available to determine the homozygotic stability and the identity of these inbred lines.

The oldest and most traditional method of analysis is the observation of phenotypic traits. The data is usually collected in field experiments over the life of the maize plants to be examined. Phenotypic characteristics most often observed are for traits associated with plant morphology, ear and kernel morphology, insect and disease resistance, maturity, and yield.

In addition to phenotypic observations, the genotype of a plant can also be examined. A plant's genotype can be used to identify plants of the same variety or a related variety. For example, the genotype can be used to determine the pedigree of a plant. There are many laboratory-based techniques available for the analysis, comparison and characterization of plant genotype; among these are Isozyme Electrophoresis, Restriction Fragment Length Polymorphisms (RFLPs), Randomly Amplified Polymorphic DNAs (RAPDs), Arbitrarily Primed Polymerase Chain Reaction (AP-PCR), DNA Amplification Fingerprinting (DAF), Sequence Characterized Amplified Regions (SCARs), Amplified Fragment Length Polymorphisms (AFLPs), Simple Sequence Repeats (SSRs) which are also referred to as Microsatellites, and Single Nucleotide Polymorphisms (SNPs).

Isozyme Electrophoresis and RFLPs as discussed in Lee, M., “Inbred Lines of Maize and Their Molecular Markers,” The Maize Handbook, (Springer-Verlag, New York, Inc. 1994, at 423-432) incorporated herein by reference, have been widely used to determine genetic composition. Isozyme Electrophoresis has a relatively low number of available markers and a low number of allelic variants among maize inbreds. RFLPs allow more discrimination because they have a higher degree of allelic variation in maize and a larger number of markers can be found. Both of these methods have been eclipsed by SSRs as discussed in Smith et al., “An evaluation of the utility of SSR loci as molecular markers in maize (Zea mays L.): comparisons with data from RFLPs and pedigree”, Theoretical and Applied Genetics (1997) vol. 95 at 163-173 and by Pejic et al., “Comparative analysis of genetic similarity among maize inbreds detected by RFLPs, RAPDs, SSRs, and AFLPs,” Theoretical and Applied Genetics (1998) at 1248-1255 incorporated herein by reference. SSR technology is more efficient and practical to use than RFLPs; more marker loci can be routinely used and more alleles per marker locus can be found using SSRs in comparison to RFLPs. Single Nucleotide Polymorphisms may also be used to identify the unique genetic composition of the invention and progeny lines retaining that unique genetic composition. Various molecular marker techniques may be used in combination to enhance overall resolution.

Maize DNA molecular marker linkage maps have been rapidly constructed and widely implemented in genetic studies. One such study is described in Boppenmaier, et al., “Comparisons among strains of inbreds for RFLPs”, Maize Genetics Cooperative Newsletter, 65:1991, pg. 90, is incorporated herein by reference.

Inbred maize line PH6CF is a yellow, dent maize inbred that is best suited to be used as the male in the production of first generation F₁ maize hybrids. Inbred maize line PH6CF is best adapted to the Central Corn Belt, Eastern, Southcentral, and Southeast areas of the United States and can be used to produce hybrids with approximately a 119 maturity based on the Comparative Relative Maturity Rating System for harvest moisture of grain. Inbred maize line PH6CF demonstrates above average tolerance to Northern Leaf Blight, Southern Leaf Blight, Anthracnose stalk rot, Fusarium ear rot, and Giberella ear rot as an inbred per se. As an inbred per se PH6CF also has above average stalk and root strength. In hybrid combination inbred PH6CF demonstrates short ear and plant height, good foliar disease tolerance, and above average grain test weight.

The inbred has shown uniformity and stability within the limits of environmental influence for all the traits as described in the Variety Description Information (Table 1) that follows. The inbred has been self-pollinated and ear-rowed a sufficient number of generations with careful attention paid to uniformity of plant type to ensure the homozygosity and phenotypic stability necessary to use in commercial production. The line has been increased both by hand and in isolated fields with continued observation for uniformity. No variant traits have been observed or are expected in PH6CF.

Inbred maize line PH6CF, being substantially homozygous, can be reproduced by planting seeds of the line, growing the resulting maize plants under-self-pollinating or sib-pollinating conditions with adequate isolation, and harvesting the resulting seed using techniques familiar to the agricultural arts.

TABLE 1 VARIETY DESCRIPTION INFORMATION VARIETY = PH6CF 1. TYPE:  2 1=Sweet 2=Dent 3=Flint 4=Flour 5=Pop 6=Ornamental 2. MATURITY: HEAT DAYS UNITS 076 1,522.2 From emergence to 50% of plants in silk 075 1,486.2 From emergence to 50% of plants in pollen 002 0,054.7 From 10% to 90% pollen shed From 50% silk to harvest at 25% moisture 3. PLANT: Standard Sample Deviation Size 0,215.2 cm Plant Height (to tassel tip) 17.19 30 0,070.2 cm Ear Height (to base of top ear node) 11.96 30 0,013.2 cm Length of Top Ear Internode  2.26 30    0.0 Average Number of Tillers  0.04  6    0.9 Average Number of Ears per Stalk  0.16  6    4.0 Anthocyanin of Brace Roots: 1 =Absent 2=Faint 3=Moderate 4=Dark 5=Very Dark 4. LEAF: Standard Sample Deviation Size 009.4 cm Width of Ear Node Leaf 1.05 30 076.6 cm Length of Ear Node Leaf 3.49 30  06.8 Number of leaves above top ear 0.63 30 022.2 Degrees Leaf Angle (measure from 2nd 2.65 30 leaf above ear at anthesis to stalk above leaf) 03  Leaf Color Dark Green   (*MC)   5GY36  1.8 Leaf Sheath Pubescence (Rate on scale from 1=none to 9=like peach fuzz) Marginal Waves (Rate on scale from 1=none to 9=many) Longitudinal Creases (Rate on scale from 1=none to 9=many) 5. TASSEL: Standard Sample Deviation Size  06.8 Number of Primary Lateral Branches 1.17 30 026.6 Branch Angle from Central Spike 5.46 30  50.9 cm Tassel Length (from top leaf collar to tassel tip) 2.54 30  5.2 Pollen Shed (rate on scale from 0=male sterile to 9=heavy shed) 17  Anther Color Purple (*MC) 10RP26 17  Glume Color Purple (*MC) 10RP28  1.0 Bar Glumes (Glume Bands): 1=Absent 2=Present 23  cm Peduncle Length (cm. from top leaf to basal branches) 6a. EAR (Unhusked Data): 11 Silk Color (3 days after emergence) Pink (*MC) 10RP58  1 Fresh Husk Color (25 days after 50% (*MC) 5GY78 Light Green 21 Dry Husk Color (65 days after 50% (*MC) 10YR92 silking) Buff  1 Position of Ear at Dry Husk Stage: 1=Upright 2=Horizontal 3=Pendant  7 Husk Tightness (Rate of Scale from 1=very loose to 9=very tight)  2 Husk Extension (at harvest): 1=Short (ears exposed) 2=Medium (<8 cm) 3=Long (8-10 cm beyond ear tip) 4=Very Long (>10 cm) 6b. EAR (Husked Ear Data): Standard Sample Deviation Size 17 cm Ear Length  1.76 30 38 mm Ear Diameter at mid-point  2.32 30 92 gm Ear Weight 28.46 30 13 Number of Kernel Rows  0.52 30  2 Kernel Rows: 1=Indistinct 2=Distinct  2 Row Alignment: 1=Straight 2=Slightly Curved 3=Spiral  8 cm Shank Length  2.32 30  2 Ear Taper: 1=Slight 2=Average 3=Extreme 7. KERNEL (Dried): Standard Sample Deviation Size  9 mm Kernel Length  0.52 30  9 mm Kernel Width  0.55 30  6 mm Kernel Thickness  0.41 30 74 % Round Keels (Shape Grade) 14.95  6  1 Aleurone Color Pattern: 1=Homozygous 2=Segregating  7 Aluerone Color Yellow (*MC) 1.25Y714 10 Hard Endosperm Color Pink-Orange (*MC) 10YR610  3 Endosperm Type: Normal Starch 1=Sweet (Sul) 2=Extra Sweet (sh2) 3=Normal Starch 4=High Amylose Starch 5=Waxy Starch 6=High Protein 7=High Lysine 8=Super Sweet (se) 9=High Oil 10=Other    32 gm Weight per 100 Kernels  1.72  6 (unsized sample) 8. COB: Standard Sample Deviation Size 23 mm Cob Diameter at mid-point 0.82 30 19 Cob Color White (*MC) 5Y91 9. DISEASE RESISTANCE (Rate from 1 (most susceptible) to   9 (most resistant); leave blank if not tested; leave Race or   Strain Options blank if polygenic): A. Leaf Blights, Wilts, and Local Infection Diseases Anthracnose Leaf Blight (Colletotrichum graminicola) 5 Common Rust (Puccinia Common Smut (Ustilago Eyespot (Kabatiella zeae) Goss's Wilt (Clavibacter michiganense spp.nebraskense) 5 Gray Leaf Spot (Cercospora zeae-maydis) Helminthosporium Leaf Spot (Bipolaris zeicola) Race——— 6 Northern Leaf Blight (Exserohilum turcicum) Race——— 8 Southern Leaf Blight (Bipolaris maydis) Race——— Southern Rust (Puccinia polysora) 5 Stewart's Wilt (Erwinia stewartii) Other (Specify)——— B. Systemic Diseases Corn Lethal Necrosis (MCMV and MDMV) Head Smut (Sphacelotheca reiliana) Maize Chlorotic Dwarf Virus (MDV) Maize Chlorotic Mottle Virus (MCMV) 3 Maize Dwarf Mosaic Virus (MDMV) Sorghum Downy Mildew of Corn (Peronosclerospora sorghi) Other (Specify)——— C. Stalk Rots 6 Anthracnose Stalk Rot (Colletotrichum graminicola) Diplodia Stalk Rot (Stenocarpella maydis) Fusarium Stalk Rot (Fusarium moniliforme) Gibberella Stalk Rot (Gibberella zeae) Other (Specify)——— D. Ear and Kernel Rots Aspergillus Ear and Kernel Rot (Aspergillus flavus) 4 Diplodia Ear Rot (Stenocarpella maydis) 6 Fusarium Ear and Kernel Rot (Fusarium moniliforme) 9 Gibberella Ear Rot (Gibberella zeae) Other (Specify)——— 10. INSECT RESISTANCE (Rate from 1 (most susceptible) to 9 (most   resistant); (leave blank if not tested) Banks grass Mite (Oligonychus pratensis) Corn Worm (Helicoverpa zea) (sorghi) Leaf Feeding (maydis) Silk Feeding mg larval wt. Ear Damage Corn Leaf Aphid (Rhopalosiphum maidis) Corn Sap Beetle (Carpophilus dimidiatus European Corn Borer (Ostrinia nubilalis) 5 1st Generation (Typically Whorl Leaf Feeding) 4 2nd Generation (Typically Leaf Sheath-Collar Feeding) Stalk Tunneling cm tunneled/plant Fall Armyworm (Spodoptera fruqiperda) Leaf Feeding Silk Feeding mg larval wt. Maize Weevil (Sitophilus zeamaize Northern Rootworm (Diabrotica barberi) Southern Rootworm (Diabrotica undecimpunctata) Southwestern Corn Borer (Diatreaea grandiosella) Leaf Feeding Stalk Tunneling cm tunneled/plant Two-spotted Spider Mite (Tetranychus unicae) Western Rootworm (Diabrotica virgifrea virgifera) Other (Specify)——— 11. AGRONOMIC TRAITS:    6 Staygreen (at 65 days after anthesis) (Rate on a scale from 1=worst to    0.0 % Dropped Ears (at 65 days after anthesis) % Pre-anthesis Brittle Snapping % Pre-anthesis Root Lodging    0.0 Post-anthesis Root Lodging (at 65 days after anthesis) 3,793 Kg/ha Yield (at 12-13% grain moisture) *MC = Munsell Code (in interpreting the foregoing color designations reference may be made to the Munsell Glossy Book of Color, a standard color reference) Further Embodiments of the Invention

This invention also is directed to methods for producing a maize plant by crossing a first parent maize plant with a second parent maize plant wherein either the first or second parent maize plant is an inbred maize plant of the line PH6CF. Further, both first and second parent maize plants can come from the inbred maize line PH6CF. Still further, this invention also is directed to methods for producing an inbred maize line PH6CF-derived maize plant by crossing inbred maize line PH6CF with a second maize plant and growing the progeny seed, and repeating the crossing and growing steps with the inbred to maize line PH6CF-derived plant from 1 to 2 times, 1 to 3 times 1 to 4 times, or 1 to 5 times. Thus, any such methods using the inbred maize line PH6CF are part of this invention: selfing, sibbing, backcrosses, hybrid production, crosses to populations, and the like. All plants produced using inbred maize line PH6CF as a parent are within the scope of this invention, including plants derived from inbred maize line PH6CF. This includes varieties essentially derived from variety PH6CF with the term “essentially derived variety” having the meaning ascribed to such term in 7 U.S.C. § 2104(a)(3) of the Plant Variety Protection Act, which definition is hereby incorporated by reference. This also includes progeny plants and parts thereof with at least one ancestor that is PH6CF, and more specifically, where the pedigree of the progeny includes 1, 2, 3, 4, and/or 5 or less cross-pollinations to a maize plant other than PH6CF or a plant that has PH6CF as a progenitor. All breeders of ordinary skill in the art maintain pedigree records of their breeding programs. These pedigree records contain a detailed description of the breeding process, including a listing of all parental lines used in the breeding process and information on how such line was used. Thus, a breeder would know if PH6CF were used in the development of a progeny line, and would also know how many crosses to a line other than PH6CF or line with PH6CF as a progenitor were made in the development of any progeny line. The inbred maize line may also be used in crosses with other, different, maize inbreds to produce first generation (F₁) maize hybrid seeds and plants with superior characteristics.

Specific methods and products produced using inbred line PH6CF in plant breeding are encompassed within the scope of the invention listed above.

One such embodiment is a method for developing a PH6CF progeny maize plant in a maize plant breeding program comprising: obtaining PH6CF or its parts, utilizing said plant or plant parts as a source of breeding material; and selecting a PH6CF progeny plant with molecular markers in common with PH6CF or morphological and/or physiological characteristics selected from the characteristics listed in Tables 1 or 2. Breeding steps that may be used in the maize plant breeding program include pedigree breeding, backcrossing, mutation breeding, and recurrent selection. In conjunction with these steps, techniques such as restriction fragment polymorphism enhanced selection, genetic marker enhanced selection (for example SSR markers), and the making of double haploids may be utilized.

Another such embodiment is the method of crossing inbred maize line PH6CF with another maize plant, such as a different maize inbred line, to form a first generation population of F1 hybrid plants. The population of first generation F1 hybrid plants produced by this method is also an embodiment of the invention. This first generation population of F1 plants will comprise an essentially complete set of the alleles of inbred line PH6CF. One of ordinary skill in the art can utilize either breeder books or molecular methods to identify a particular F₁ hybrid plant produced using inbred line PH6CF, and any such individual plant is also encompassed by this invention. These embodiments also cover use of these methods with transgenic or single gene conversions of inbred line PH6CF.

Another such embodiment of this invention is a method of using inbred line PH6CF in breeding that involves the repeated backcrossing to inbred line PH6CF any number of times. Using backcrossing methods, or even the tissue culture and transgenic methods described herein, the single gene conversion methods described herein, or other breeding methods known to one of ordinary skill in the art, one can develop individual plants, plant cells, and populations of plants that retain at least 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 99.5% genetic contribution from inbred line PH6CF. The percentage of the genetics retained in the progeny may be measured by either pedigree analysis or through the use of genetic techniques such as molecular markers or electrophoresis. In pedigree analysis, on average 50% of the starting germplasm would be passed to the progeny line after one cross to another line, 25% after another cross to a different line, and so on. Molecular markers could also be used to confirm and/or determine the pedigree of the progeny line.

One method for producing a line derived from inbred line PH6CF is as follows. One of ordinary skill in the art would obtain a seed from the cross between inbred line PH6CF and another variety of maize, such as an elite inbred variety. The F1 seed derived from this cross would be grown to form a homogeneous population. The F1 seed would contain essentially all of the is alleles from variety PH6CF and essentially all of the alleles from the other maize variety. The F1 nuclear genome would be made-up of 50% variety PH6CF and 50% of the other elite variety. The F1 seed would be grown and allowed to self, thereby forming F2 seed. On average the F2 seed would have derived 50% of its alleles from variety PH6CF and 50% from the other maize variety, but many individual plants from the population would have a greater percentage of their alleles derived from PH6CF (Wang J. and R. Bernardo, 2000, Crop Sci. 40:659-665 and Bernardo, R. and A. L. Kahler, 2001, Theor. Appl. Genet 102:986-992). The molecular markers of PH6CF could be used to select and retain those lines with high similarity to PH6CF. The F2 seed would be grown and selection of plants would be made based on visual observation, markers and/or measurement of traits. The traits used for selection may be any PH6CF trait described in this specification, including the inbred maize PH6CF traits of comparably good stalk and root strength and comparably good tolerance to leaf blight, stalk rot and ear rot as mentioned herein. Such traits may also be the good general or specific combining ability of PH6CF, including its ability to produce hybrids with an approximate 119 CRM maturity, comparably short ear and plant height, comparably good foliar disease tolerance and/or comparably high grain test weight. The PH6CF progeny plants that exhibit one or more of the desired PH6CF traits, such as those listed above, would be selected and each plant would be harvested separately. This F3 seed from each plant would be grown in individual rows and allowed to self. Then selected rows or plants from the rows would be harvested individually. The selections would again be based on visual observation, markers and/or measurements for desirable traits of the plants, such as one or more of the desirable PH6CF traits listed above. The process of growing and selection would be repeated any number of times until a PH6CF progeny inbred plant is obtained. The PH6CF progeny inbred plant would contain desirable traits derived from inbred plant PH6CF, some of which may not have been expressed by the other maize variety to which inbred line PH6CF was crossed and some of which may have been expressed by both maize varieties but now would be at a level equal to or greater than the level expressed in inbred variety PH6CF. However, in each case the resulting progeny line would benefit from the efforts of the inventor(s), and would not have existed but for the inventor(s) work in creating PH6CF. The PH6CF progeny inbred plants would have, on average, 50% of their nuclear genes derived from inbred line PH6CF, but many individual plants from the population would have a greater percentage of their alleles derived from PH6CF. This breeding cycle, of crossing and selfing, and optional selection, may be repeated to produce another population of PH6CF progeny maize plants with, on average, 25% of their nuclear genes derived from inbred line PH6CF, but, again, many individual plants from the population would have a greater percentage of their alleles derived from PH6CF. Another embodiment of the invention is a PH6CF progeny plant that has received the desirable PH6CF traits listed above through the use of PH6CF, which traits were not exhibited by other plants used in the breeding process.

The previous example can be modified in numerous ways, for instance selection may or may not occur at every selfing generation, selection may occur before or after the actual self-pollination process occurs, or individual selections may be made by harvesting individual ears, plants, rows or plots at any point during the breeding process described. In addition, double haploid breeding methods may be used at any step in the process. The population of plants produced at each and any cycle of breeding is also an embodiment of the invention, and on average each such population would predictably consist of plants containing approximately 50% of its genes from inbred line PH6CF in the first breeding cycle, 25% of its genes from inbred line PH6CF in the second breeding cycle, 12.5% of its genes from inbred line PH6CF in the third breeding cycle and so on. However, in each case the use of PH6CF provides a substantial benefit. The linkage groups of PH6CF would be retained in the progeny lines, and since current estimates of the maize genome size is about 50,000-80,000 genes (Xiaowu, Gai et al., Nucleic Acids Research, 2000, Vol. 28, No. 1, 94-96), in addition to non-coding DNA that impacts gene expression, it provides a significant advantage to use PH6CF as starting material to produce a line that retains desired genetics or traits of PH6CF.

Another embodiment of this invention is the method of obtaining a substantially homozygous PH6CF progeny plant by obtaining a seed from the cross of PH6CF and another maize plant and applying double haploid methods to the F₁ seed or F₁ plant or to any successive filial generation. Such methods decrease the number of generations required to produce an inbred with similar genetics or characteristics to PH6CF. See Bernardo, R. and Kahler, A. L., Theor. Appl. Genet. 102:986992, 2001.

A further embodiment of the invention is a single gene conversion of PH6CF. A single gene conversion occurs when DNA sequences are introduced through traditional (non-transformation) breeding techniques, such as backcrossing (Hallauer et al, 1988). DNA sequences, whether naturally occurring or transgenes, may be introduced using these traditional breeding techniques. The term single gene conversion is also referred to in the art as a single locus conversion. Reference is made to US2002/0062506A1 for a detailed discussion of single locus conversions and traits that may be incorporated into PH6CF through single gene conversion. Desired traits transferred through this process include, but are not limited to, waxy starch, nutritional enhancements, industrial enhancements, disease resistance, insect resistance, herbicide resistance and yield enhancements. The trait of interest is transferred from the donor parent to the recurrent parent, in this case, the maize plant disclosed herein. Single gene traits may result from either the transfer of a dominant allele or a recessive allele. Selection of progeny containing the trait of interest is accomplished by direct selection for a trait associated with a dominant allele. Selection of progeny for a trait that is transferred via a recessive allele, such as the waxy starch characteristic, requires growing and selfing the first backcross generation to determine which plants carry the recessive alleles. Recessive traits may require additional progeny testing in successive backcross generations to determine the presence of the gene of interest. Along with selection for the trait of interest, progeny are selected fro the phenotype of the recurrent parent. It should be understood that occasionally additional polynucleotide sequences or genes are is transferred along with the single gene conversion trait of interest. A progeny comprising at least 98%, 99%, 99.5% and 99.9% of the genes from the recurrent parent, the maize line disclosed herein, plus containing the single gene conversion trait or traits of interest, is considered to be a single gene conversion of inbred line PH6CF.

It should be understood that the inbred could, through routine manipulation by detasseling, cytoplasmic genes, nuclear genes, or other factors, be produced in a male-sterile form. Such embodiments are also within the scope of the present claims. The term manipulated to be male sterile refers to the use of any available techniques to produce a male sterile version of maize line PH6CF. The male sterility may be either partial or complete male sterility.

This invention is also directed to the use of PH6CF in tissue culture. As used herein, the term plant includes plant protoplasts, plant cell tissue cultures from which maize plants can be regenerated, plant calli, plant clumps, and plant cells that are intact in plants or parts of plants, such as embryos, pollen, ovules, seeds, flowers, kernels, ears, cobs, leaves, husks, stalks, roots, root tips, anthers, silk and the like. As used herein, phrases such as “growing the seed” or “grown from the seed” include embryo rescue, isolation of cells from seed for use in tissue culture, as well as traditional growing methods.

Duncan, Williams, Zehr, and Widholm, Planta (1985) 165:322-332 reflects that 97% of the plants cultured that produced callus were capable of plant regeneration. Subsequent experiments with both inbreds and hybrids produced 91% regenerable callus that produced plants. In a further study in 1988, Songstad, Duncan & Widholm in Plant Cell Reports (1988), 7:262-265 reports several media additions that enhance regenerability of callus of two inbred lines. Other published reports also indicated that “nontraditional” tissues are capable of producing somatic embryogenesis and plant regeneration. K. P. Rao, et al., Maize Genetics Cooperation Newsletter, 60:64-65 (1986), refers to somatic embryogenesis from glume callus cultures and B. V. Conger, et al., Plant Ce11 Reports, 6:345-347 (1987) indicates somatic embryogenesis from the tissue cultures of maize leaf segments. Thus, it is clear from the literature that the state of the art is such that these methods of obtaining plants are, and were, “conventional” in the sense that they are routinely used and have a very high rate of success.

Tissue culture of maize, including tassel/anther culture, is described in U.S. 2002/0062506A1 and European Patent Application, publication 160,390, each of which is incorporated herein by reference. Maize tissue culture procedures are also described in Green and Rhodes, “Plant Regeneration in Tissue Culture of Maize,” Maize for Biological Research (Plant Molecular Biology Association, Charlottesville, Virginia 1982, at 367-372) and in Duncan, et al., “The Production of Callus Capable of Plant Regeneration from Immature Embryos of Numerous Zea Mays Genotypes,” 165 Planta 322-332 (1985). Thus, another aspect of this invention is to provide cells, which upon growth and differentiation produce maize plants having the genotype and/or physiological and morphological characteristics of inbred line PH6CF.

The utility of inbred maize line PH6CF also extends to crosses with other species. Commonly, suitable species will be of the family Graminaceae, and especially of the genera Zea, Tripsacum, Coix, Schlerachne, Polytoca, Chionachne, and Tfilobachne, of the tribe Maydeae. Potentially suitable for crosses with PH6CF may be the various varieties of grain sorghum, Sorghum bicolor (L.) Moench.

The advent of new molecular biological techniques has allowed the isolation and characterization of genetic elements with specific functions, such as encoding specific protein products. Scientists in the field of plant biology developed a strong interest in engineering the genome of plants to contain and express foreign genetic elements, or additional, or modified versions of native or endogenous genetic elements in order to alter the traits of a plant in a specific manner. Any DNA sequences, whether from a different species or from the same species that are inserted into the genome using transformation are referred to herein collectively as “transgenes”. Over the last fifteen to twenty years several methods for producing transgenic plants have been developed, and the present invention, in particular embodiments, also relates to transformed versions of the claimed inbred maize line PH6CF.

Numerous methods for plant transformation have been developed, including biological and physical, plant transformation protocols. See, for example, Miki et al., “Procedures for Introducing Foreign DNA into Plants” in Methods in Plant Molecular Biology and Biotechnology, Glick, B. R. and Thompson, J. E. Eds. (CRC Press, Inc., Boca Raton, 1993) pages 67-88 and Armstrong, “The First Decade of Maize Transformation: A Review and Future Perspective” (Maydica 44:101-109, 1999). In addition, expression vectors and in vitro culture methods for plant cell or tissue transformation and regeneration of plants are available. See, for example, Gruber et al., “Vectors for Plant Transformation” in Methods in Plant Molecular Biology and Biotechnology, Glick, B. R. and Thompson, J. E. Eds. (CRC Press, Inc., Boca Raton, 1993) pages 89-119. See U.S. Pat. No. 6,118,055, which is herein incorporated by reference.

The most prevalent types of plant transformation involve the construction of an expression vector. Such a vector comprises a DNA sequence that contains a gene under the control of or operatively linked to a regulatory element, for example a promoter. The vector may contain one or more genes and one or more regulatory elements.

A genetic trait which has been engineered into a particular maize plant using transformation techniques, could be moved into another line using traditional breeding techniques that are well known in the plant breeding arts. For example, a backcrossing approach could be used to move a transgene from a transformed maize plant to an elite inbred line and the resulting progeny would comprise a transgene. Also, if an inbred line was used for the transformation then the transgenic plants could be crossed to a different inbred in order to produce a transgenic hybrid maize plant. As used herein, “crossing” can refer to a simple X by Y cross, or the process of backcrossing, depending on the context.

Various genetic elements can be introduced into the plant genome using transformation. These elements include but are not limited to genes; coding sequences; inducible, constitutive, and tissue specific promoters; enhancing sequences; and signal and targeting sequences. See U.S. Pat. No. 6,118,055, which is herein incorporated by reference.

With transgenic plants according to the present invention, a foreign protein can be produced in commercial quantities. Thus, techniques for the selection and propagation of transformed plants, which are well understood in the art, yield a plurality of transgenic plants, which are harvested in a conventional manner, and a foreign protein then can be extracted from a tissue of interest or from total biomass. Protein extraction from plant biomass can be accomplished by known methods, which are discussed, for example, by Heney and Orr, Anal. Biochem. 114: 92-6 (1981).

According to a preferred embodiment, the transgenic plant provided for commercial production of foreign protein is maize. In another preferred embodiment, the biomass of interest is seed. A genetic map can be generated, primarily via conventional Restriction Fragment Length Polymorphisms (RFLP), Polymerase Chain Reaction (PCR) analysis, and Simple Sequence Repeats (SSR) and Single Nucleotide Polymorphisms (SNP), which identify the approximate chromosomal location of the integrated DNA molecule. For exemplary methodologies in this regard, see Glick and Thompson, METHODS IN PLANT MOLECULAR BIOLOGY AND BIOTECHNOLOGY 269-284 (CRC Press, Boca Raton, 1993).

Wang et al. discuss “Large Scale Identification, Mapping and Genotyping of Single-Nucleotide Polymorphorsms in the Human Genome”, Science, 280:1077-1082, 1998, and similar capabilities will soon be available for the corn genome. Map information concerning chromosomal location is useful for proprietary protection of a subject transgenic plant. If unauthorized propagation is undertaken and crosses made with other germplasm, the map of the integration region can be compared to similar maps for suspect plants, to determine if the latter have a common parentage with the subject plant. Map comparisons would involve hybridizations, RFLP, PCR, SSR and sequencing, all of which are conventional techniques. SNP's may also be used alone or in combination with other techniques.

Likewise, by means of the present invention, plants can be genetically engineered to express various phenotypes of agronomic interest. Through the transformation of maize the expression of genes can be modulated to-enhance disease resistance, insect resistance, herbicide resistance, agronomic traits as well as grain quality traits. Transformation can also be used to insert DNA sequences which control or help control male-sterility. DNA sequences native to maize as well as non-native DNA sequences can be transformed into maize and used to modulate levels of native or non-native proteins. Anti-sense technology, various promoters, targeting sequences, enhancing sequences, and other DNA sequences can be inserted into the maize genome for the purpose of modulating the expression of proteins. Exemplary transgenes implicated in this regard include, but are not limited to, those categorized below.

-   1. Transgenes that Confer Resistance to Pests or Disease and that     Encode:     -   (A) Plant disease resistance genes. Plant defenses are often         activated by specific interaction between the product of a         disease resistance gene (R) in the plant and the product of a         corresponding avirulence (Avr) gene in the pathogen. A plant         variety can be transformed with cloned resistance gene to         engineer plants that are resistant to specific pathogen strains.         See, for example Jones et al., Science 266: 789 (1994) (cloning         of the tomato Cf-9 gene for resistance to Cladosporium fulvum);         Martin et al., Science 262: 1432 (1993) (tomato Pto gene for         resistance to Pseudomonas syringae pv. tomato encodes a protein         kinase); Mindrinos et al., Cell 78: 1089 (1994) (Arabidopsis         RSP2 gene for resistance to Pseudomonas syringae).     -   (B) A Bacillus thuringiensis protein, a derivative thereof or a         synthetic polypeptide modeled thereon. See, for example, Geiser         et al., Gene 48: 109 (1986), who disclose the cloning and         nucleotide sequence of a Bt δ-endotoxin gene. Moreover, DNA         molecules encoding 8-endotoxin genes can be purchased from         American Type Culture Collection (Rockville, Md.), for example,         under ATCC Accession Nos. 40098, 67136, 31995 and 31998. Other         examples of Bacillus thuringiensis transgenes being genetically         engineered are given in the following patents and hereby are         incorporated by reference: 5,188,960; 5,689,052; 5,880,275; and         WO 97/40162.     -   (C) A lectin. See, for example, the disclosure by Van Damme et         al., Plant Molec. Biol. 24: 25 (1994), who disclose the         nucleotide sequences of several Clivia miniata mannose-binding         lectin genes.     -   (D) A vitamin-binding protein such as avidin. See PCT         application US^(93/06487) the contents of which are hereby         incorporated by reference. The application teaches the use of         avidin and avidin homologues as larvicides against insect pests.     -   (E) An enzyme inhibitor, for example, a protease inhibitor or an         amylase inhibitor. See, for example, Abe et al., J. Biol. Chem.         262: 16793 (1987) (nucleotide sequence of rice cysteine         proteinase inhibitor), Huub et al., Plant Molec. Biol. 21:         985 (1993) (nucleotide sequence of cDNA encoding tobacco         proteinase inhibitor 1), and Sumitani et al., Biosci. Biotech.         Biochem. 57: 1243 (1993) (nucleotide sequence of Streptomyces         nitrosporeus α-amylase inhibitor) and U.S. Pat. No. 5,494,813.     -   (F) An insect-specific hormone or pheromone such as an         ecdysteroid and juvenile hormone, a variant thereof, a mimetic         based thereon, or an antagonist or agonist thereof. See, for         example, the disclosure by Hammock et al., Nature 344: 458         (1990), of baculovirus expression of cloned juvenile hormone         esterase, an inactivator of juvenile horrnone.     -   (G) An insect-specific peptide or neuropeptide, which, upon         expression, disrupts the physiology of the affected pest. For         example, see the disclosures of Regan, J. Biol. Chem. 269:         9 (1994) (expression cloning yields DNA coding for insect         diuretic hormone receptor), and Pratt et al., Biochem. Biophys.         Res. Comm. 163: 1243 (1989) (an allostatin is identified in         Diploptera puntata). See also U.S. Pat. No. 5,266,317 to         Tomalski et al., who disclose genes encoding insect-specific,         paralytic neurotoxins.     -   (H) An insect-specific venom produced in nature by a snake, a         wasp, etc. For example, see Pang et al., Gene 116: 165 (1992),         for disclosure of heterologous expression in plants of a gene         coding for a scorpion insectotoxic peptide.     -   (I) An enzyme responsible for an hyperaccumulation of a         monterpene, a sesquiterpene, a steroid, hydroxamic acid, a         phenylpropanoid derivative or another non-protein molecule with         insecticidal activity.     -   (J) An enzyme involved in the modification, including the         post-translational modification, of a biologically active         molecule; for example, a glycolytic enzyme, a proteolytic         enzyme, a lipolytic enzyme, a nuclease, a cyclase, a         transaminase, an esterase, a hydrolase, a phosphatase, a kinase,         a phosphorylase, a polymerase, an elastase, a chitinase and a         glucanase, whether natural or synthetic. See PCT application WO         93/02197 in the name of Scott et al., which discloses the         nucleotide sequence of a callase gene. DNA molecules which         contain chitinase-encoding sequences can be obtained, for         example, from the ATCC under Accession Nos. 39637 and 67152. See         also Kramer et al., Insect Biochem. Molec. Biol. 23: 691 (1993),         who teach the nucleotide sequence of a cDNA encoding tobacco         hookworm chitinase, and Kawalleck et al., Plant Molec. Biol. 21:         673 (1993), who provide the nucleotide sequence of the parsley         ubi4-2 polyubiquitin gene.     -   (K) A molecule that stimulates signal transduction. For example,         see the disclosure by Botella et al., Plant Molec. Biol. 24: 757         (1994), of nucleotide sequences for mung bean calmodulin cDNA         clones, and Griess et al., Plant Physiol. 104: 1467 (1994), who         provide the nucleotide sequence of a maize calmodulin cDNA         clone.     -   (L) A hydrophobic moment peptide. See PCT application WO95/16776         (disclosure of peptide derivatives of Tachyplesin which inhibit         fungal plant pathogens) and PCT application WO95/18855 (teaches         synthetic antimicrobial peptides that confer disease         resistance), the respective contents of which are hereby         incorporated by reference.     -   (M) A membrane permease, a channel former or a channel blocker.         For example, see the disclosure by Jaynes et al., Plant Sci. 89:         43 (1993), of heterologous expression of a cecropin-β lytic         peptide analog to render transgenic tobacco plants resistant to         Pseudomonas solanacearum.     -   (N) A viral-invasive protein or a complex toxin derived         therefrom. For example, the accumulation of viral coat proteins         in transformed plant cells imparts resistance to viral infection         and/or disease development effected by the virus from which the         coat protein gene is derived, as well as by related viruses. See         Beachy et al., Ann. Rev. Phytopathol. 28: 451 (1990). Coat         protein-mediated resistance has been conferred upon transformed         plants against alfalfa mosaic virus, cucumber mosaic virus,         tobacco streak virus, potato virus X, potato virus Y, tobacco         etch virus, tobacco rattle virus and tobacco mosaic virus. Id.     -   (O) An insect-specific antibody or an immunotoxin derived         therefrom. Thus, an antibody targeted to a critical metabolic         function in the insect gut would inactivate an affected enzyme,         killing the insect. Cf. Taylor et al., Abstract #497, SEVENTH         INt'L SYMPOSIUM ON MOLECULAR PLANT-MICROBE INTERACTIONS         (Edinburgh, Scotland, 1994) (enzymatic inactivation in         transgenic tobacco via production of single-chain antibody         fragments).     -   (P) A virus-specific antibody. See, for example, Tavladoraki et         al., Nature 366: 469 (1993), who show that transgenic plants         expressing recombinant antibody genes are protected from virus         attack.     -   (Q) A developmental-arrestive protein produced in nature by a         pathogen or a parasite. Thus, fungal endo         α-1,4-D-polygalacturonases facilitate fungal colonization and         plant nutrient release by solubilizing plant cell wall         homo-α-1,4-D-galacturonase. See Lamb et al., Bio/Technology 10:         1436 (1992). The cloning and characterization of a gene which         encodes a bean endopolygalacturonase-inhibiting protein is         described by Toubart et al., Plant J. 2: 367 (1992).     -   (R) A developmental-arrestive protein produced in nature by a         plant. For example, Logemann et al., Bio/Technology 10: 305         (1992), have shown that transgenic plants expressing the barley         ribosome-inactivating gene have an increased resistance to         fungal disease.     -   (S) Genes involved in the Systemic Acquired Resistance (SAR)         Response and/or the pathogenesis related genes. Briggs, S.,         Current Biology, 5(2) (1995).     -   (T) Antifungal genes (Cornelissen and Melchers. Pl. Physiol.         101:709-712, (1993) and Parijs et al., Planta         183:258-264, (1991) and Bushnell et al., Can. J. of Plant Path.         20(2): 137-149 (1998). -   2. Transgenes that Confer Resistance to a Herbicide, For Example:     -   (A) A herbicide that inhibits the growing point or meristem,         such as an imidazolinone or a sulfonylurea. Exemplary genes in         this category code for mutant ALS and AHAS enzyme as described,         for example, by Lee et al., EMBO J. 7: 1241 (1988), and Miki et         al., Theor. Appl. Genet. 80: 449 (1990), respectively. See also,         U.S. Pat. Nos. 5,605,011; 5,013,659; 5,141,870; 5,767,361;         5,731,180; 5,304,732; 4,761,373; 5,331,107; 5,928,937; and         5,378,824; and international publication WO 96/33270, which are         incorporated herein by reference in their entireties for all         purposes.     -   (B) Glyphosate (resistance imparted by mutant         5-enolpyruvl-3-phosphikimate synthase (EPSP) and aroA genes,         respectively) and other phosphono compounds such as glufosinate         (phosphinothricin acetyl transferase (PAT) and Streptomyces         hygroscopicus phosphinothricin acetyl transferase (bar) genes),         and pyridinoxy or phenoxy proprionic acids and cycloshexones         (ACCase inhibitor-encoding genes). See, for example, U.S. Pat.         No. 4,940,835 to Shah et al., which discloses the nucleotide         sequence of a form of EPSPS, which can confer glyphosate         resistance. U.S. Pat. No. 5,627,061 to Barry et al. also         describes genes encoding EPSPS enzymes. See also U.S. Pat. Nos.         6,248,876 B1; 6,040,497; 5,804,425; 5,633,435; 5,145,783;         4,971,908; 5,312,910; 5,188,642; 4,940,835; 5,866,775; 6,225,114         B1; 6,130,366; 5,310,667; 4,535,060; 4,769,061; 5,633,448;         5,510,471; Re. 36,449; RE 37,287 E; and 5,491,288; and         international publications WO 97/04103; WO 97/04114; WO         00/66746; WO 01/66704; WO 00/66747 and WO 00/66748, which are         incorporated herein by reference in their entirety. Glyphosate         resistance is also imparted to plants that express a gene that         encodes a glyphosate oxido-reductase enzyme as described more         fully in U.S. Pat. Nos. 5,776,760 and 5,463,175, which are         incorporated herein by reference in their entirety. In addition         glyphosate resistance can be imparted to plants by the over         expression of genes encoding glyphosate N-acetyltransferase.         See, for example, U.S. application Ser. Nos. 60/244,385;         60/377,175 and 60/377,719. A DNA molecule encoding a mutant aroA         gene can be obtained under ATCC accession No. 39256, and the         nucleotide sequence of the mutant gene is disclosed in U.S. Pat.         No. 4,769,061 to Comai. European patent application No. 0 333         033 to Kumada et al. and U.S. Pat. No. 4,975,374 to Goodman et         al. disclose nucleotide sequences of glutamine synthetase genes         which confer resistance to herbicides such as         L-phosphinothricin. The nucleotide sequence of a         phosphinothricin-acetyl-transferase gene is provided in European         patent No. 0 242 246 and 0 242 236 to Leemans et al. De Greef et         al., Bio/Technology 7: 61 (1989), describe the production of         transgenic plants that express chimeric bar genes coding for         phosphinothricin acetyl transferase activity. See also, U.S.         Pat. Nos. 5,969,213; 5,489,520; 5,550,318; 5,874,265; 5,919,675;         5,561,236; 5,648,477; 5,646,024; 6,177,616 B1; and 5,879,903,         which are incorporated herein by reference in their entirety.         Exemplary of genes conferring resistance to phenoxy proprionic         acids and cycloshexones, such as sethoxydim and haloxyfop, are         the Acc1-S1, Acc1-S2 and Acc1-S3 genes described by Marshall et         al., Theor. Appl. Genet. 83: 435 (1992).     -   (C) A herbicide that inhibits photosynthesis, such as a triazine         (psbA and gs+genes) and a benzonitrile (nitrilase gene).         Przibilla et al., Plant Cell 3: 169 (1991), describe the         transformation of Chlamydomonas with plasmids encoding mutant         psbA genes. Nucleotide sequences for nitrilase genes are         disclosed in U.S. Pat. No. 4,810,648 to Stalker, and DNA         molecules containing these genes are available under ATCC         Accession Nos. 53435,67441 and 67442. Cloning and expression of         DNA coding for a glutathione S-transferase is described by Hayes         et al., Biochem. J. 285: 173 (1992).     -   (D) Acetohydroxy acid synthase, which has been found to make         plants that express this enzyme resistant to multiple types of         herbicides, has been introduced into a variety of plants (see,         e.g., Hattori et al. (1995) Mol Gen Genet 246:419). Other genes         that confer tolerance to herbicides include: a gene encoding a         chimeric protein of rat cytochrome P4507A1 and yeast         NADPH-cytochrome P450 oxidoreductase (Shiota et al. (1994) Plant         PhysiolPlant Physiol 106:17), genes for glutathione reductase         and superoxide dismutase (Aono et al. (1995) Plant Cell Physiol         36:1687, and genes for various phosphotransferases (Datta et         al. (1992) Plant Mol Biol 20:619).     -   (E) Protoporphyrinogen oxidase (protox) is necessary for the         production of chlorophyll, which is necessary for all plant         survival. The protox enzyme serves as the target for a variety         of herbicidal compounds. These herbicides also inhibit growth of         all the different species of plants present, causing their total         destruction. The development of plants containing altered protox         activity which are resistant to these herbicides are described         in U.S. Pat. Nos. 6,288,306 B1; 6,282,837 B1; and 5,767,373; and         international publication WO 01/12825, which are incorporated         herein by reference in their entireties of all purposes.         3. Transgenes that Confer or Contribute to a Value-Added Trait,         Such as:     -   (A) Modified fatty acid metabolism, for example, by transforming         a plant with an antisense gene of stearoyl-ACP desaturase to         increase stearic acid content of the plant. See Knultzon et al.,         Proc. Natl. Acad. Sci. USA 89: 2624 (1992).     -   (B) Decreased phytate content         -   (1) Introduction of a phytase-encoding gene would enhance             breakdown of phytate, adding more free phosphate to the             transformed plant. For example, see Van Hartingsveldt et             al., Gene 127: 87 (1993), for a disclosure of the nucleotide             sequence of an Aspergillus niger phytase gene.         -   (2) A gene could be introduced that reduces phytate content.             In maize, this, for example, could be accomplished, by             cloning and then re-introducing DNA associated with the             single allele which is responsible for maize mutants             characterized by low levels of phytic acid. See Raboy et             al., Maydica 35:383 (1990).     -   (C) Modified carbohydrate composition effected, for example, by         transforming plants with a gene coding for an enzyme that alters         the branching pattern of starch. See Shiroza et al., J.         Bacteriol. 170: 810 (1988) (nucleotide sequence of Streptococcus         mutans fructosyltransferase gene), Steinmetz et a!., Mol. Gen.         Genet. 200: 220 (1985) (nucleotide sequence of Bacillus subtilis         levansucrase gene), Pen et al., Bio/Technology 10: 292 (1992)         (production of transgenic plants that express Bacillus         licheniformis α-amylase), Elliot et al., Plant Molec. Biol. 21:         515 (1993) (nucleotide sequences of tomato invertase genes),         SØogaard et al., J. Biol. Chem. 268: 22480 (1993) (site-directed         mutagenesis of barley α-amylase gene), and Fisher et al., Plant         Physiol. 102: 1045 (1993) (maize endosperm starch branching         enzyme 11).     -   (D) Elevated oleic acid via FAD-2 gene modification and/or         decreased linolenic acid via FAD-3 gene modification (see U.S.         Pat. Nos. 6,063,947; 6,323,392; and WO 93/11245).         4. Genes that Control Male-sterility     -   (A) Introduction of a deacetylase gene under the control of a         tapetum-specific promoter and with the application of the         chemical N-Ac-PPT (WO 01/29237).     -   (B) Introduction of various stamen-specific promoters (WO         92/13956, WO 92/13957).     -   (C) Introduction of the barnase and the barstar gene (Paul et         al. Plant Mol. Biol. 19:611-622, 1992).

INDUSTRIAL APPLICABILITY

Maize is used as human food, livestock feed, and as raw material in industry. The food uses of maize, in addition to human consumption of maize kernels, include both products of dry- and wet-milling industries. The principal products of maize dry milling are grits, meal and flour. The maize wet-milling industry can provide maize starch, maize syrups, and dextrose for food use. Maize oil is recovered from maize germ, which is a by-product of both dry- and wet-milling industries.

Maize, including both grain and non-grain portions of the plant, is also used extensively as livestock feed, primarily for beef cattle, dairy cattle, hogs, and poultry.

Industrial uses of maize include production of ethanol, maize starch in the wet-milling industry and maize flour in the dry-milling industry. The industrial applications of maize starch and flour are based on functional properties, such as viscosity, film formation, adhesive properties, and ability to suspend particles. The maize starch and flour have application in the paper and textile industries. Other industrial uses include applications in adhesives, building materials, foundry binders, laundry starches, explosives, oil-well muds, and other mining applications.

Plant parts other than the grain of maize are also used in industry: for example, stalks and husks are made into paper and wallboard and cobs are used for fuel and to make charcoal.

The seed of inbred maize line PH6CF, the plant produced from the inbred seed, the hybrid maize plant produced from the crossing of the inbred, hybrid seed, and various parts of the hybrid maize plant and transgenic versions of the foregoing, can be utilized for human food, livestock feed, and as a raw material in industry.

Performance Examples of PH6CF

In the examples that follow, data from traits and characteristics of inbred maize line PH6CF per se and in a hybrid are given and compared to other maize inbred lines and hybrids.

Inbred Comparison

The results in Table 2A compare inbred PH6CF to inbred PH09B. The results show inbred PH6CF demonstrated significantly earlier stand count scores than PH09B and significantly fewer tillers. Inbred PH6CF had a significantly larger tassel size and had a significantly greater pollen weight value than inbred PH09B. Inbred PH6CF also had significantly better scores than PH09B for stay green and Anthracnose stalk rot resistance.

The results in Table 2B compare inbred PH6CF to inbred PHW52. The results show inbred PH6CF demonstrated significantly better scores than inbred PHW52 for stay green, Gray Leaf Spot resistance, and Anthracnose stalk rot resistance.

The results in Table 2C compare inbred PH6CF to inbred PH2JR. The results show that inbred PH6CF flowered (GDUSHD and GDUSLK) significantly earlier than inbred PH2JR and had significantly greater pollen weight values. Inbred PH6CF also had significantly better scores than inbred PH2JR for scatter grain, ear mold resistance and Fusarium ear rot resistance.

Hybrid Comparisons

The results in Table 3A compare a hybrid in which one of the parents is PH6CF and a second hybrid, 31G98. The results show that the hybrid containing PH6CF produced grain with significantly higher test weight. The hybrid containing PH6CF grew to a significantly shorter plant height and had significantly lower placement of the ear than 31 G98. The hybrid containing PH6CF also demonstrated significantly better scores for resistance to artificial brittle stalk lodging, regular stalk lodging, husk cover, Southern Leaf Blight, and Fusarium ear rot than hybrid 31G98.

The results in Table 3B compare a hybrid in which one of the parents is PH6CF and a second hybrid, 3245. The results show that the hybrid containing PH6CF produced significantly higher yield and grew to a significantly shorter plant height. The hybrid containing PH6CF also had significantly better scores for stay green than hybrid 3245.

The results in Table 3C compare a hybrid in which one of the parents is PH6CF and a second hybrid, 3163. The results show that the hybrid containing PH6CF produced significantly higher yield and test weight. The hybrid containing PH6CF grew to a significantly shorter plant height, had significantly lower placement, and had significantly better scores for second generation European Corn Borer resistance than 3163.

TABLE 2A PAIRED INBRED COMPARISON REPORT Variety #1: PH6CF Variety #2: PH09B YIELD YIELD MST TSTWT EGRWTH ESTCNT BU/A 56# BU/A56# PCT LB/BU SCORE COUNT Stat ABS % MN ABS ABS ABS ABS Mean1 58.8 77.2 23.8 54.8 5.9 22.5 Mean2 101.1 133.7 20.9 56.0 5.6 18.8 Locs 22 22 23 2 36 28 Reps 22 22 23 2 36 28 Diff −42.3 −56.5 −2.9 −1.2 0.3 3.8 Prob 0.000 0.000 0.001 0.156 0.076 0.000 TILLER GDUSHD GDUSLK POLWT POLWT TASBLS PCT GDU GDU VALUE VALUE SCORE Stat ABS ABS ABS ABS % MN ABS Mean1 0.3 147.7 150.9 136.1 94.0 9.0 Mean2 2.0 140.5 145.6 100.3 66.4 9.0 Locs 23 61 62 18 18 10 Reps 23 61 62 18 18 10 Diff 1.7 7.2 5.3 35.8 27.6 0.0 Prob 0.044 0.000 0.000 0.013 0.016 1.000 TASSZ PLTHT EARHT STAGRN STKLDG BRTSTK SCORE CM CM SCORE % NOT % NOT Stat ABS ABS ABS ABS ABS ABS Mean1 4.6 223.8 81.8 6.1 100.0 100.0 Mean2 3.8 224.5 87.4 5.1 96.7 98.3 Locs 46 47 5 14 6 1 Reps 46 47 5 14 6 1 Diff 0.8 −0.8 −5.6 1.0 3.3 1.7 Prob 0.000 0.694 0.418 0.033 0.363 — SCTGRN EARSZ TEXEAR EARMLD BARPLT DRPEAR SCORE SCORE SCORE SCORE % NOT % NOT Stat ABS ABS ABS ABS ABS ABS Mean1 5.9 5.0 7.0 6.8 87.2 100.0 Mean2 7.2 6.0 6.5 6.5 97.6 100.0 Locs 13 2 6 10 36 1 Reps 13 2 6 10 36 1 Diff −1.2 −1.0 0.5 0.3 −10.4 0.0 Prob 0.009 1.000 0.076 0.468 0.000 — GLFSPT NLFBLT SLFBLT STWWLT ANTROT MDMCPX SCORE SCORE SCORE SCORE SCORE SCORE Stat ABS ABS ABS ABS ABS ABS Mean1 5.0 5.0 7.7 4.5 5.5 3.2 Mean2 4.7 4.0 7.2 3.0 3.6 1.8 Locs 11 2 3 1 5 3 Reps 11 2 3 1 5 3 Diff 0.4 1.0 0.5 1.5 1.9 1.3 Prob 0.221 0.500 0.225 — 0.012 0.094 FUSERS GIBERS DIPERS COMRST CLDTST CLDTST SCORE SCORE SCQRE SCORE PCT PCT Stat ABS ABS ABS ABS ABS % MN Mean1 6.5 9.0 5.0 5.2 86.1 101.8 Mean2 6.0 9.0 7.3 5.6 84.6 100.1 Locs 15 1 3 5 9 9 Reps 15 1 3 5 9 9 Diff 0.5 0.0 −2.3 −0.4 1.6 1.7 Prob 0.142 — 0.192 0.374 0.433 0.465 HD KSZDCD SMT ERTLDG STLPCN ERTLPN LRTLPN PCT % NOT % NOT % NOT % NOT % NOT Stat ABS ABS ABS ABS ABS ABS Mean1 1.9 98.3 66.7 85.0 100.0 100.0 Mean2 11.0 84.6 48.0 40.0 100.0 100.0 Locs 9 2 1 2 1 1 Reps 9 2 1 2 1 1 Diff −9.2 13.7 18.7 45.0 0.0 0.0 Prob 0.004 0.500 — 0.421 — —

TABLE 2B PAIRED INBRED COMPARISON REPORT Variety #1: PH6CF Variety #2: PHW52 EGRWTH ESTCNT TILLER GDUSHD GDUSLK TASBLS SCORE COUNT PCT GDU GDU SCORE Stat ABS ABS ABS ABS ABS ABS Mean1 6.0 21.0 0.4 147.7 150.9 9.0 Mean2 5.6 20.6 0.4 143.5 149.0 9.0 Locs 30 23 19 53 54 7 Reps 30 23 19 53 54 7 Diff 0.3 0.4 0.0 4.2 1.8 0.0 Prob 0.077 0.396 0.979 0.000 0.011 1.000 TASSZ PLTHT EARHT STAGRN STKLDG SCTGRN SCORE CM CM SCORE % NOT SCORE Stat ABS ABS ABS ABS ABS ABS Mean1 4.5 223.6 51.9 6.0 100.0 6.0 Mean2 5.5 209.2 50.0 3.5 100.0 8.7 Locs 41 40 4 12 5 12 Reps 41 40 4 12 5 12 Diff −1.0 14.4 1.9 2.5 0.0 −0.7 Prob 0.000 0.000 0.704 0.001 1.000 0.255 EARSZ TEXEAR EARMLD BARPLT DRPEAR GLFSPT SCORE SCORE SCORE % NOT % NOT SCORE Stat ABS ABS ABS ABS ABS ABS Mean1 5.0 7.2 7.1 88.3 100.0 5.0 Mean2 6.0 6.2 6.4 92.0 100.0 3.0 Locs 1 5 8 27 1 10 Reps 1 5 8 27 1 10 Diff −1.0 1.0 0.8 −3.7 0.0 2.0 Prob — 1.000 0.351 0.088 — 0.000 NLFBLT SLFBLT STWWLT ANTROT MDMCPX FUSERS SCORE SCORE SCORE SCORE SCORE SCORE Stat ABS ABS ABS ABS ABS ABS Mean1 5.0 7.7 4.5 5.5 3.2 6.6 Mean2 4.5 6.3 3.0 4.4 2.5 5.9 Locs 2 3 1 5 3 13 Reps 2 3 1 5 3 13 Diff 0.5 1.3 1.5 1.1 0.7 0.7 Prob 1.000 0.184 — 0.051 0.270 0.071 HD GIBERS DIPERS COMRST SMT ERTLDG ERTLPN SCORE SCORE SCORE % NOT % NOT % NOT Stat ABS ABS ABS ABS ABS ABS Mean1 9.0 5.0 5.2 98.3 66.7 100.0 Mean2 9.0 5.5 4.4 100.0 84.0 100.0 Locs 1 3 5 2 1 1 Reps 1 3 5 2 1 1 Diff 0.0 −0.5 0.8 −1.7 −17.3 0.0 Prob — 0.423 0.178 0.500 — —

TABLE 2C PAIRED INBRED COMPARISON REPORT Variety #1: PH6CF Variety #2: PH2JR YIELD YIELD MST TSTWT EGRWTH ESTCNT BU/A 56# BU/A 56# PCT LB/BU SCORE COUNT Stat ABS % MN ABS ABS ABS ABS Mean1 54.4 79.3 23.0 54.8 6.0 22.7 Mean2 69.8 104.4 21.9 55.1 5.4 22.0 Locs 21 21 22 2 30 23 Reps 21 21 22 2 30 23 Diff −15.4 −25.1 −1.2 −0.4 0.6 0.7 Prob 0.004 0.002 0.252 0.932 0.003 0.204 TILLER GDUSHD GDUSLK POLWT POLWT TASBLS PCT GDU GDU VALUE VALUE SCORE Stat ABS ABS ABS ABS % MN ABS Mean1 0.4 147.4 150.9 116.0 67.1 9.0 Mean2 1.8 151.0 153.0 76.1 43.3 9.0 Locs 20 52 53 6 6 7 Reps 20 52 53 6 6 7 Diff 1.4 −3.6 −2.1 39.9 23.8 0.0 Prob 0.162 0.000 0.000 0.044 0.044 1.000 TASSZ PLTHT EARHT STAGRN STKLDG BRTSTK SCORE CM CM SCORE % NOT % NOT Stat ABS ABS ABS ABS ABS ABS Mean1 4.7 225.2 82.6 6.1 100.0 100.0 Mean2 5.1 221.4 81.9 6.7 95.8 96.6 Locs 40 40 4 12 6 1 Reps 40 40 4 12 6 1 Diff −0.4 3.7 0.6 −0.6 4.2 3.4 Prob 0.045 0.122 0.934 0.171 0.363 — SCTGRN EARSZ TEXEAR EARMLD BARPLT DRPEAR SCORE SCORE SCORE SCORE % NOT % NOT Stat ABS ABS ABS ABS ABS ABS Mean1 6.0 5.0 7.0 6.8 87.9 100.0 Mean2 7.0 6.0 6.8 5.5 96.7 100.0 Locs 13 1 5 11 30 1 Reps 13 1 5 11 30 1 Diff −1.0 −1.0 0.2 1.3 −8.7 0.0 Prob 0.042 — 0.374 0.018 0.002 — GLFSPT NLFBLT SLFBLT ANTROT MDMCPX FUSERS SCORE SCORE SCORE SCORE SCORE SCORE Stat ABS ABS ABS ABS ABS ABS Mean1 4.7 6.5 7.8 6.8 3.5 7.0 Mean2 5.0 5.5 6.8 6.0 3.0 5.4 Locs 7 1 2 2 1 10 Reps 7 1 2 2 1 10 Diff −0.3 1.0 1.0 0.8 0.5 1.6 Prob 0.172 — 1.000 0.500 — 0.008 GIBERS DIPERS COMRST ECBILF ECB2SC CLDTST SCORE SCORE SCORE SCORE SCORE PCT Stat ABS ABS ABS ABS ABS ABS Mean1 9.0 5.3 5.3 5.0 4.0 86.1 Mean2 9.0 6.5 4.6 5.0 4.5 87.1 Locs 1 3 6 1 1 9 Reps 1 3 6 1 1 9 Diff 0.0 −1.2 0.7 0.0 −0.5 −1.0 Prob — 0.192 0.286 — — 0.731 HD CLDTST KSZDCD SMT ERTLDG STLPCN ERTLPN PCT PCT % NOT % NOT % NOT % NOT Stat % MN ABS ABS ABS ABS ABS Mean1 101.8 1.9 100.0 66.7 65.0 100.0 Mean2 103.0 3.8 100.0 25.0 85.0 100.0 Locs 9 9 2 1 2 1 Reps 9 9 2 1 2 1 Diff −1.2 −2.0 0.0 41.7 0.0 0.0 Prob 0.719 0.019 1.000 13 1.000 — LRTLPN % NOT Stat ABS Mean1 100.0 Mean2 100.0 Locs 1 Reps 1 Diff 0.0 Prob —

TABLE 3A INBREDS IN HYBRID COMBINATION REPORT Variety #1: HYBRID CONTAINING PH6CF Variety #2: 31G98 YIELD YIELD MST EGRWTH ESTCNT GDUSHD BU/A 56# BU/A 56# PCT SCORE COUNT GDU Stat ABS % MN % MN % MN % MN % MN Mean1 196.7 103.2 102.2 91.4 102.0 101.0 Mean2 195.2 103.1 100.1 94.1 96.8 102.9 Locs 117 117 119 22 4 26 Reps 117 117 119 22 4 26 Diff 1.5 0.1 −2.2 −2.7 5.2 −1.8 Prob 0.507 0.914 0.004 0.430 0.090 0.000 GDUSLK STKCNT PLTHT EARHT STAGRN ERTLSC GDU COUNT IN IN SCORE SCORE Stat % MN % MN % MN % MN % MN ABS Mean1 101.5 100.1 95.8 90.4 116.6 6.0 Mean2 103.0 99.6 101.5 105.2 108.8 9.0 Locs 20 194 28 28 35 1 Reps 20 194 28 28 35 1 Diff −1.5 0.6 −5.6 −14.8 7.8 −3.0 Prob 0.006 0.230 0.000 0.000 0.175 . LRTLSC STKLDS STKLDG STKLDL EBTSTK ABTSTK SCORE SCORE % NOT % NOT % NOT % NOT Stat ABS ABS % MN % MN % MN % MN Mean1 8.0 7.1 104.9 115.9 104.3 129.1 Mean2 4.0 6.6 96.2 106.5 102.0 54.9 Locs 1 14 8 18 2 8 Reps 1 14 8 18 2 8 Diff 4.0 0.5 8.7 9.4 2.3 74.2 Prob . 0.561 0.048 0.324 0.602 0.000 TSTWT GLFSPT NLFBLT SLFBLT ANTROT CLN LB/BU SCORE SCORE SCORE SCORE SCORE Stat ABS ABS ABS ABS ABS ABS Mean1 56.9 5.6 4.8 6.7 3.9 4.0 Mean2 56.1 5.1 5.7 4.2 5.1 4.3 Locs 84 7 3 7 10 2 Reps 84 7 3 7 10 2 Diff 0.8 0.4 −0.8 2.5 −1.2 −0.3 Prob 0.000 0.289 0.300 0.000 0.055 0.500 MDMCPX FUSERS DIPERS COMRST ECB1LF ECB2SC SCORE SCORE SCORE SCORE SCORE SCORE Stat ABS ABS ABS ABS ABS ABS Mean1 3.5 6.1 3.0 5.0 5.5 5.0 Mean2 3.2 4.9 5.0 5.0 5.3 4.1 Locs 3 8 1 1 3 5 Reps 3 8 1 1 3 5 Diff 0.3 1.2 −2.0 0.0 0.2 0.9 Prob 0.529 0.029 . . 0.423 0.276 HD HSKCVR BRTSTK SMT ERTLPN LRTLPN STLPCN SCORE % NOT % NOT % NOT % NOT % NOT Stat ABS ABS ABS ABS ABS ABS Mean1 6.0 100.0 96.8 84.6 100.0 88.9 Mean2 5.3 98.2 96.8 83.5 100.0 80.7 Locs 20 1 6 8 2 30 Reps 20 1 6 8 2 30 Diff 0.7 1.8 −0.0 1.0 0.0 8.2 Prob 0.010 . 0.980 0.934 1.000 0.002

TABLE 3B INBREDS IN HYBRID COMBINATION REPORT Variety #1: HYBRID CONTAINING PH6CF Variety #2: 3245 YIELD YIELD MST EGRWTH ESTCNT GDUSHD GDUSLK STKCNT BU/A 56# BU/A 56# PCT SCORE COUNT GDU GDU COUNT Stat ABS % MN % MN % MN % MN % MN % MN % MN Mean1 188.2 104.9 102.3 97.2 102.0 100.5 100.3 99.4 Mean2 174.3 96.9 94.3 108.1 101.9 99.5 101.6 100.7 Locs 77 77 79 13 4 8 7 103 Reps 77 77 79 13 4 8 7 103 Diff 13.9 8.0 −8.0 −10.8 0.1 1.0 −1.3 −1.3 Prob 0.000 0.000 0.000 0.038 0.962 0.058 0.068 0.085 PLTHT EARHT STAGRN ERTLSC LRTLSC STKLDS STKLDG STKLDL IN IN SCORE SCORE SCORE SCORE % NOT % NOT Stat % MN % MN % MN ABS ABS ABS % MN % MN Mean1 95.9 91.2 112.9 6.0 8.0 7.1 103.9 105.4 Mean2 98.0 94.5 78.2 9.0 7.0 6.6 101.5 103.8 Locs 13 13 22 1 1 18 8 8 Reps 13 13 22 1 1 18 8 8 Diff −2.1 −3.3 34.8 −3.0 1.0 0.5 2.4 1.6 Prob 0.023 0.135 0.000 . . 0.509 0.306 0.825 EBTSTK ABTSTK TSTWT GLFSPT NLFBLT SLFBLT ANTROT CLN % NOT % NOT LB/BU SCORE SCORE SCORE SCORE SCORE Stat % MN % MN ABS ABS ABS ABS ABS ABS Mean1 104.3 108.6 57.2 5.0 5.0 7.0 3.6 4.0 Mean2 102.2 89.2 58.4 4.1 4.0 4.3 3.2 3.5 Locs 2 3 56 4 2 2 6 1 Reps 2 3 56 4 2 2 6 1 Diff 2.1 19.4 −1.1 0.9 1.0 2.8 0.4 0.5 Prob 0.500 0.227 0.000 0.133 0.295 0.170 0.392 . MDMCPX FUSERS DIPERS COMRST ECB1LF ECB2SC HSKCVR HD SMT SCORE SCORE SCORE SCORE SCORE SCORE SCORE % NOT Stat ABS ABS ABS ABS ABS ABS ABS ABS Mean1 3.0 5.5 3.0 5.0 6.3 4.5 4.6 96.1 Mean2 2.0 4.3 4.0 3.0 5.3 4.3 5.4 94.0 Locs 1 3 1 1 2 3 8 3 Reps 1 3 1 1 2 3 8 3 Diff 1.0 1.2 −1.0 2.0 1.0 0.2 −0.8 2.1 Prob . 0.250 . . 0.295 0.808 0.080 0.614

TABLE 3C INBREDS IN HYBRID COMBINATION REPORT Variety #1: HYBRID CONTAINING PH6CF Variety #2: 3163 YIELD YIELD MST EGRWTH ESTCNT GDUSHD GDUSLK STKCNT BU/A 56# BU/A 56# PCT SCORE COUNT GDU GDU COUNT Stat ABS % MN % MN % MN % MN % MN % MN % MN Mean1 187.3 104.7 102.3 97.2 102.0 100.5 100.3 99.4 Mean2 169.1 94.1 103.4 100.4 101.2 102.7 102.9 100.7 Locs 76 76 78 13 4 8 7 103 Reps 76 76 78 13 4 8 7 103 Diff 18.2 10.7 1.0 −3.2 0.8 −2.1 −2.6 −1.2 Prob 0.000 0.000 0.328 0.571 0.802 0.019 0.016 0.084 PLTHT EARHT STAGRN ERTLSC LRTLSC STKLDS STKLDG STKLDL IN IN SCORE SCORE SCORE SCORE % NOT % NOT Stat % MN % MN % MN ABS ABS ABS % MN % MN Mean1 95.9 91.2 112.9 6.0 8.0 7.1 103.9 105.4 Mean2 99.7 101.7 117.9 8.0 4.0 5.4 102.1 101.9 Locs 13 13 22 1 1 18 8 8 Reps 13 13 22 1 1 18 8 8 Diff −3.8 −10.5 −4.9 −2.0 4.0 1.7 1.8 3.6 Prob 0.010 0.003 0.362 . . 0.089 0.296 0.671 EBTSTK ABTSTK TSTWT GLFSPT NLFBLT SLFBLT ANTROT CLN % NOT % NOT LB/BU SCORE SCORE SCORE SCORE SCORE Stat % MN % MN ABS ABS ABS ABS ABS ABS Mean1 104.3 108.6 57.2 5.0 5.0 7.0 3.6 4.0 Mean2 101.2 99.3 55.8 5.0 6.5 6.5 3.1 3.5 Locs 2 3 55 4 2 2 6 1 Reps 2 3 55 4 2 2 6 1 Diff 3.1 9.2 1.3 0.0 −1.5 0.5 0.5 0.5 Prob 0.500 0.666 0.000 1.000 0.205 0.500 0.270 . MDMCPX FUSERS DIPERS COMRST ECB1LF ECB2SC HSKCVR HD SMT SCORE SCORE SCORE SCORE SCORE SCORE SCORE % NOT Stat ABS ABS ABS ABS ABS ABS ABS ABS Mean1 3.0 5.5 3.0 5.0 6.3 4.5 4.6 96.1 Mean2 3.5 5.8 4.0 4.0 6.0 3.7 4.4 99.1 Locs 1 3 1 1 2 3 8 3 Reps 1 3 1 1 2 3 8 3 Diff −0.5 −0.3 −1.0 1.0 0.3 0.8 0.3 −3.0 Prob . 0.423 . . 0.795 0.038 0.649 0.188 Genetic Marker Profile Through SSR

The present invention comprises an inbred corn plant which is characterized by the molecular and physiological data presented herein and in the representative sample of said line deposited with the ATCC. Further provided by the invention is a hybrid corn plant formed by the combination of the disclosed inbred corn plant or plant cell with another corn plant or cell and characterized by being heterozygous for the molecular data of the inbred.

In addition to phenotypic observations, a plant can also be identified by its genotype. The genotype of a plant can be characterized through a genetic marker profile which can identify plants of the same variety or a related variety or be used to determine or validate a pedigree. Genetic marker profiles can be obtained by techniques such as Restriction Fragment Length Polymorphisms (RFLPs), Randomly Amplified Polymorphic DNAs (RAPDs), Arbitrarily Primed Polymerase Chain Reaction (AP-PCR), DNA Amplification Fingerprinting (DAF), Sequence Characterized Amplified Regions (SCARs), Amplified Fragment Length Polymorphisms (AFLPs), Simple Sequence Repeats (SSRs) which are also referred to as Microsatellites, and Single Nucleotide Polymorphisms (SNPs). For example, see Berry, Don, et al., “Assessing Probability of Ancestry Using Simple Sequence Repeat Profiles: Applications to Maize Hybrids and Inbreds”, Genetics, 2002, 161:813-824, which is incorporated by reference herein in its entirety.

Particular markers used for these purposes are not limited to the set of markers disclosed herein, but are envisioned to include any type of marker and marker profile which provides a means of distinguishing varieties. In addition to being used for identification of Inbred Line PH6CF, a hybrid produced through the use of PH6CF, and the identification or verification of pedigree for progeny plants produced through the use of PH6CF, the genetic marker profile is also useful in breeding and developing single gene conversions.

Means of performing genetic marker profiles using SSR polymorphisms are well known in the art. SSRs are genetic markers based on polymorphisms in repeated nucleotide sequences, such as microsatellites. A marker system based on SSRs can be highly informative in linkage analysis relative to other marker systems in that multiple alleles may be present. Another advantage of this type of marker is that, through use of flanking primers, detection of SSRs can be achieved, for example, by the polymerase chain reaction (PCR), thereby eliminating the need for labor-intensive Southern hybridization. The PCR™ detection is done by use of two oligonucleotide primers flanking the polymorphic segment of repetitive DNA. Repeated cycles of heat denaturation of the DNA followed by annealing of the primers to their complementary sequences at low temperatures, and extension of the annealed primers with DNA polymerase, comprise the major part of the methodology.

Following amplification, markers can be scored by gel electrophoresis of the amplification products. Scoring of marker genotype is based on the size of the amplified fragment as measured by molecular weight (MW) rounded to the nearest integer. While variation in the primer used or in laboratory procedures can affect the reported molecular weight, relative values should remain constant regardless of the specific primer or laboratory used. When comparing lines it is preferable if all SSR profiles are performed in the same lab. The SSR analyses reported herein were conducted in-house at Pioneer Hi-Bred. An SSR service is available to the public on a contractual basis by Paragen (formerly Celera AgGen) in Research Triangle Park, North Carolina.

Primers used for the SSRs reported herein are publicly available and may be found at the World Wide Web at agron.missouri.edu/maps.html (sponsored by the University of Missouri), in Sharopova et al. (Plant Mol. Biol. 48(5-6):463-481), Lee et al (Plant Mol. Biol. 48(5-6); 453-461), or reported herein. Some marker information may be available from Paragen.

Map information is provided in centimorgans (cM) and based on a composite map developed by Pioneer Hi-Bred. This composite map was created by identifying common markers between various maps and using linear regression to place the intermediate markers. The reference map used was UMC98. Map positions for the SSR markers reported herein will vary depending on the mapping population used. Any chromosome numbers reported in parenthesis represent other chromosome locations for such marker that have been reported in the literature or on the Maize DB. Map positions are available on the Maize DB for a variety of different mapping populations.

TABLE 4 SSR Profile PH6CF Locus Chrom # Position mwt PHI427913 1 26.71 131 BNLG1429 1 30.68 207 BNLG1627 1 34.03 205 BNLG439 1 62.42 237 BNLG1886 1 91.64 148 BNLG2086 1 94.5 221 BNLG1615 1 142.74 215 BNLG1556 1 150.53 205 PHI423298 1 174.38 135 PHI335539 1 178.84  91 PHI308707 1 211.59 134 PHI265454 1 221.46 228 PHI227562 1 242.7 298 BNLG1832 1 unknown 218 BNLG1083 1 unknown 225 BNLG1017 2 21.79 197 BNLG1909 2 76.87 314 BNLG1396 2 120.07 139 PHI328189 2 145.57 118 BNLG2237 2 148.65 254 PHI251315 2 149.77 127 PHI435417 2 302.56 220 BNLG1520 2 375.32 289 PHI427434 2 413.55 133 PHI402893 2 unknown 221 BNLG1141 2 unknown 155 PHI453121 3 0.2 220 PHI404206 3 2.2 306 BNLG1523 3 34.3 267 PHI243966 3 52.24 215 PHI374118 3 53.66 230 BNLG1452 3 58.58 140 BNLG1113 3 58.65  98 BNLG1019 3 58.65 173 PHI053 3 67.9 194 PHI102228 3 104.98 131 PHI193225 3 159.24 134 PHI029 3 Unknown 160 PHI295450 4 16.87 199 PHI213984 4 25.02 287 BNLG1162 4 40.01  96 PHI079 4 65.46 180 BNLG1937 4 65.49 230 BNLG1265 4 67.31 226 PHI314704 4 159.67 147 PHI438301 4 819.88 214 PHI308090 4 unknown 223 BNLG1006 5 15.9 232 PHI331888 5 91.48 133 PHI386223 5 95.46 141 PHI330507 5 102.23 144 PHI333597 5 103.48 219 PHI196387 5 133.31 231 PHI423796 6 31.29 131 PHI389203 6 83.56 307 PHI452693 6 98.06 126 PHI445613 6 106.74 100 PHI364545 6 126.24 134 PHI299852 6 129.9 111 BNLG2271 7 95.38 237 PHI328175 7 100.36 101 PHI260485 7 134.62 288 PHI420701 8 24.32 291 PHI233376 8 219.36 151 PHI448880 9 126.07 179 PHI236654 9 157.45 120 BNLG1375 9 unknown 168 BNLG1129 9 unknown 302 PHI059 10  40.55 147 PHI96342 10  52.8 249 PHI301654 10  91.26 132 PHI323152 10  117.1 137 BNLG1450 10  126.36 242 BNLG1597 5 (1, 6) 154.8 236

The SSR profile of Inbred PH6CF can be used to identify hybrids comprising PH6CF as a parent, since such hybrids will comprise the same alleles as PH6CF. Because an inbred is essentially homozygous at all relevant loci, an inbred should, in almost all cases, have only one allele at each locus. In contrast, a genetic marker profile of a hybrid should be the sum of those parents, e.g., if one inbred parent had the allele 168 (base pairs) at a particular locus, and the other inbred parent had 172 the hybrid, is 168.172 (heterozygous) by inference. Subsequent generations of progeny produced by selection and breeding are expected to be of genotype 168 (homozygous), 172 (homozygous), or 168.172 for that locus position. When the F₁ plant is used to produce an inbred, the locus should be either 168 or 172 for that position.

In addition, plants and plant parts substantially benefiting from the use of PH6CF in their development such as PH6CF comprising a single gene conversion, transgene, or genetic sterility factor, may be identified by having a molecular marker profile with a high percent identity to PH6CF. Such a percent identity might be 98%, 99%, 99.5% or 99.9% identical to PH6CF.

The SSR profile of PH6CF also can be used to identify essentially derived varieties and other progeny lines developed from the use of PH6CF, as well as cells and other plant parts thereof. Progeny plants and plant parts produced using PH6CF may be identified by having a molecular marker profile of at least 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 99.5% genetic contribution from inbred line PH6CF.

Deposits

Applicants have made a deposit of at least 2500 seeds of Inbred Maize Line PH6CF with the American Type Culture Collection (ATCC), Manassas, Va. 20110 USA, ATCC Deposit No. PTA4675. The seeds deposited with the ATCC on Sep. 18, 2002 were taken from the deposit maintained by Pioneer Hi-Bred International, Inc., 800 Capital Square, 400 Locust Street, Des Moines, Iowa 50309-2340 since prior to the filing date of this application. Access to this deposit will be available during the pendency of the application to the Commissioner of Patents and Trademarks and persons determined by the Commissioner to be entitled thereto upon request. Upon allowance of any claims in the application, the Applicants will make the deposit available to the public pursuant to 37 C.F.R § 1.808. This deposit of the Inbred Maize Line PH6CF will be maintained in the ATCC depository, which is a public depository, for a period of 30 years, or 5 years after the most recent request, or for the enforceable life of the patent, whichever is longer, and will be replaced if it becomes nonviable during that period. Additionally, Applicants has satisfied all the requirements of 37 C.F.R. §§1.801-1.809, including providing an indication of the viability of the sample upon deposit. Applicants have no authority to waive any restrictions imposed by law on the transfer of biological material or its transportation in commerce. Applicants do not waive any infringement of his rights granted under this patent or under the Plant Variety Protection Act (7 USC 2321 et seq.). U.S. Plant Variety Protection of Inbred Maize Line PH6CF has been applied for under Application No. 200200178.

All publications, patents and patent applications mentioned in the specification are indicative of the level of those skilled in the art to which this invention pertains. All such publications, patents and patent applications are incorporated by reference herein to the same extent as if each was specifically and individually indicated to be incorporated by reference herein.

The foregoing invention has been described in detail by way of illustration and example for purposes of clarity and understanding. However, it will be obvious that certain changes and modifications such as single gene conversions and mutations, somoclonal variants, variant individuals selected from large populations of the plants of the instant inbred and the like may be practiced within the scope of the invention, as limited only by the scope of the appended claims. 

1. A Seed of maize inbred line designated PH6CF, representative seed of said line having been deposited under ATCC Accession No. PTA-4675.
 2. A maize plant, or a part thereof, produced by growing the seed of claim
 1. 3. The maize plant of claim 2 wherein said plant has been detasseled.
 4. A tissue culture of regenerable cells produced from the plant of claim
 2. 5. Protoplasts produced from the tissue culture of claim
 4. 6. The tissue culture of claim 4, wherein cells of the tissue culture are produced from a tissue selected from the group consisting of leaf, pollen, embryo, root, root tip, anther, silk, flower, kernel, ear, cob, husk and stalk.
 7. A maize plant regenerated from the tissue culture of claim 4, said plant having all the morphological and physiological characteristics of inbred line PH6CF, representative seed of said line having been deposited under ATCC Accession No. PTA-4675.
 8. A method for producing an F1 hybrid maize seed, comprising crossing the plant of claim 2 with a different maize plant and harvesting the resultant F1 hybrid maize seed.
 9. A method of producing a male sterile maize plant comprising transforming the maize plant of claim 2 with a nucleic acid molecule that confers male sterility.
 10. A male sterile maize plant produced by the method of claim
 9. 11. A method of producing an herbicide resistant maize plant comprising transforming the maize plant of claim 2 with a transgene that confers herbicide resistance.
 12. An herbicide resistant maize plant produced by the method of claim
 11. 13. The maize plant of claim 12, wherein the transgene confers resistance to an herbicide selected from the group consisting of imidazolinone, sulfonylurea, glyphosate, glufosinate, L-phosphinothricin, triazine and benzonitrile.
 14. A method of producing an insect resistant maize plant comprising transforming the maize plant of claim 2 with a transgene that confers insect resistance.
 15. An insect resistant maize plant produced by the method of claim
 14. 16. The maize plant of claim 15, wherein the transgene encodes a Bacillus thuringiensis endotoxin.
 17. A method of producing a disease resistant maize plant comprising transforming the maize plant of claim 2 with a transgene that confers disease resistance.
 18. A disease resistant maize plant produced by the method of claim
 17. 19. A method of producing a maize plant with decreased phytate content comprising transforming the maize plant of claim 2 with a transgene encoding phytase.
 20. A maize plant with decreased phytate content produced by the method of claim
 19. 21. A method of producing a maize plant with modified fatty acid metabolism or modified carbohydrate metabolism comprising transforming the maize plant of claim 2 with a transgene encoding a protein selected from the group consisting of [stearoyl-ACP desaturase,] fructosyltransferase, levansucrase, alpha-amylase, invertase and starch branching enzyme or encoding an antisense of stearoyl-ACP desaturase.
 22. A maize plant, with modified fatty acid metabolism or modified carbohydrate metabolism, produced by the method of claim
 21. 23. The maize plant of claim 22 wherein the transgene confers a trait selected from the group consisting of waxy starch and increased amylose starch.
 24. A maize plant, or part thereof, having all the physiological and morphological characteristics of the inbred line PH6CF, representative seed of said line having been deposited under ATCC Accession No. PTA-44675.
 25. A method of introducing a desired trait into maize inbred line PH6CF comprising: (a) crossing PH6CF plants grown from PH6CF seed, representative seed of which has been deposited under ATCC Accession No. PTA-4675, with plants of another maize line that comprise a desired trait to produce F1 progeny plants, wherein the desired trait is selected from the group consisting of male sterility, herbicide resistance, insect resistance, disease resistance and waxy starch; (b) selecting F1 progeny plants that have the desired trait to produce selected F1 progeny plants; (c) crossing the selected progeny plants with the PH6CF plants to produce backcross progeny plants; (d) selecting for backcross progeny plants that have the desired trait and physiological and morphological characteristics of maize inbred line PH6CF listed in Table 1 to produce selected backcross progeny plants; and (e) repeating steps (c) and (d) three or more times in succession to produce selected fourth or higher backcross progeny plants that comprise the desired trait and all of the physiological and morphological characteristics of maize inbred line PH6CF listed in Table 1 as determined at the 5% significance level when grown in the same environmental conditions.
 26. A plant produced by the method of claim 25, wherein the plant has the desired trait and all of the physiological and morphological characteristics of maize inbred line PH6CF listed in Table 1 as determined at the 5% significance level when grown in the same environmental conditions.
 27. The plant of claim 26 wherein the desired trait is herbicide resistance and the resistance is conferred to an herbicide selected from the group consisting of imidazolinone, sulfonylurea, glyphosate, glufosinate, L-phosphinothricin, triazine and benzonitrile.
 28. The plant of claim 26 wherein the desired trait is insect resistance and the insect resistance is conferred by a transgene encoding a Bacillus thuringiensis endotoxin.
 29. The plant of claim 26 wherein the desired trait is male sterility and the trait is conferred by a cytoplasmic nucleic acid molecule that confers male sterility.
 30. A method of modifying fatty acid metabolism, phytic acid metabolism or carbohydrate metabolism in maize inbred line PH6CF comprising: (a) crossing PH6CF plants grown from PH6CF seed, representative seed of which has been deposited under ATCC Accession No. PTA-4675, with plants of another maize line that comprise a nucleic acid molecule encoding an enzyme selected from the group consisting of phytase, [stearoyl-ACP desaturase,] fructosyltransferase, levansucrase, alpha-amylase, invertase and starch branching enzyme or encoding an antisense of stearoyl-ACP desaturase; (b) selecting F1 progeny plants that have said nucleic acid molecule to produce selected F1 progeny plants; (c) crossing the selected progeny plants with the PH6CF plants to produce backcross progeny plants; (d) selecting for backcross progeny plants that have said nucleic acid molecule and physiological and morphological characteristics of maize inbred line PH6CF listed in Table 1 to produce selected backcross progeny plants; and (c) repeating steps (c) and (d) three or more times in succession to produce selected fourth or higher backcross progeny plants that comprise said nucleic acid molecule and have all of the physiological and morphological characteristics of maize inbred line PH6CF listed in Table 1 as determined at the 5% significance level when grown in the same environmental conditions.
 31. A plant, with modified fatty acid metabolism, modified phytic acid metabolism or modified carbohydrate metabolism, produced by the method of claim 30, wherein the plant comprises the nucleic acid molecule and has all of the physiological and morphological characteristics of maize inbred line PH6CF listed in Table 1 as determined at the 5% significance level when grown in the same environmental conditions. 